Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4031117944d736…

MALICIOUS

PDF

79.2 KB Created: 2021-05-28 16:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f7b76b32da2cc12645450016dadb8c1 SHA-1: 20a60f12074109963396081ed0f1c7577946d53a SHA-256: 0c4031117944d73600e8041d26609202d9786d2e2cd976f1bd62ce8026dfb10f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm and an SEO redirector disguised as a search result for a common technical query. The primary URL, 'https://seumenha.ru/strik?utm_term=how+to+turn+off+logitech+webcam+microphone', is likely used to redirect users to a phishing or malware-hosting site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=how+to+turn+off+logitech+webcam+microphone PDF link annotation
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/7555557.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/selojezenuzi-dedesesulasoxet-sutugox-korewofopunebuw.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/dd78768.pdfIn PDF document text
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/6285912.pdfIn PDF document text
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/lorunedigazufim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6a00d32b-9b7f-4c50-a574-3b7afee34603/what_is_the_antonym_for_lonely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e587cd4-3696-482a-a126-5e7b37e29b9b/mepewipifewik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c687f326-7f6f-4502-b305-564de0e3a6f0/semulozofatita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53534551-aea9-416c-870f-2652d8daac4e/what_does_blinking_light_on_furnace_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db413a32-792d-4115-9949-d70738b36744/negiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe27bab-517d-4002-a559-cbd5375d51d7/sawewunudinobaxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/558e6668-53c5-4400-b8cb-376051a23118/78032051036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c1981f-92f4-485f-94cc-8d4e686786c9/galaxy_saturn_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76e9557-645b-4087-9a1e-0326b321aed6/the_art_of_seeing_ghost_of_tsushima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abe5d46-52ed-44c4-8dd6-f5f2adb7ed73/ponazariresuworikum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43491270-c9b5-42b4-9bd0-30650437816f/winnie-the-pooh_books_box_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697b2692-6df1-4c68-b1f0-dbe3b24a49a5/ali_kundilli_2_full_izle_720p_sansursz_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7608082c-6a1f-4a3d-bf7a-e29354179bfb/what_is_the_current_rent_stabilization_increase_for_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42747adc-7cf5-4b12-9536-78b47f6c9f1d/vissani_wine_cooler_mcbc58dst_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc963fa-5c1c-4e1e-a4fa-1bf1d7b10fc0/kuzila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ccbad9-9fb6-4cba-85d6-b7d663b2f4af/how_many_grams_of_carbs_are_in_donut_holes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaa399b-9839-451f-b5fb-2dd9c4c77238/cyberpunk_2077_frame_rate_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b191841-1cd7-42c8-abd5-72e0253607fe/cost_to_replace_citizen_watch_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f310b3-9ff7-489f-8080-952eecc686fc/coast_guard_academy_medical_exam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5328 bytes
SHA-256: 06f930a627ad5065bb0a3208c1894678f13439b71ceb34f11d5178da4ce5726d
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 11724 bytes
SHA-256: 0711611cbdcb41748c3cc9d869ae31fdc803d07cba3211a85d5ba9e36c79b7c7
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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