Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc88d25775b99406…

MALICIOUS

PDF

66.4 KB Created: 2020-11-11 03:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f13332205aaeae994b60f2532d3059b8 SHA-1: f3501bf8ab192c302ccfa381ed8c9f75c8968833 SHA-256: fc88d25775b994063d38ecee1cfab3d54c8cafce476673497e3450164ff20aa3
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?keyword=7th+grade+physics+review In PDF document text
    • https://gupenuwod.weebly.com/uploads/1/3/4/5/134518336/mobugilofupiku-wojiromex-suvubagejiwilis-jofeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f94f1964c825.pdfIn PDF document text
    • https://rofazipupu.weebly.com/uploads/1/3/4/5/134580110/xezazetefoxemogumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f88b081590ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f9933732f6dd.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/066d862c-9227-48fa-8513-78e09719a225/nirox.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/letter_to_parents_from_teacher_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45971f92-1f8c-49c3-8112-c8589cade246/73218794926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887a530e-24b5-45de-abd8-f48a24cb8ad0/buxekutozudolorutotifef.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/skyrim_the_midden_relic_finger.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/when_a_good_man_goes_to_war_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/foot_massager_water_heat.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/silent_hunter_3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd4d8d7-1509-475a-a89b-6ec0a15ab5c8/22234188094.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 5112 bytes
SHA-256: 489ac2662c67bf478fbd9db40705cd7574068d54b485d4b88ca71a94ae553325
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 10476 bytes
SHA-256: 130c5c33c2f15dabc9fea28431d75825d4c30f42c49550e4c17ac7a0687d1407
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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