Malicious PDF — malware analysis report

Static analysis result for SHA-256 b329c23d1f2f8533…

MALICIOUS

PDF

94.4 KB Created: 2021-03-18 05:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5a7226e8016fabb2e3ac06ef72606455 SHA-1: e804f8e92add18caca71d0e275d2974fcdb11c9b SHA-256: b329c23d1f2f8533fc0578f261a4ef20e20313b6ad2b28cb5183946395941900
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The primary lure URL, 'https://lozipotod.ru/123?utm_term=alcoholic+cirrhosis+guidelines', is associated with a phishing and redirector heuristic. ClamAV also detected this file as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent related to phishing or malware distribution via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/123?utm_term=alcoholic+cirrhosis+guidelines PDF link annotation
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/4524064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_603912d510d07.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/sufubedozofuzoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_602d487953f25.pdfIn PDF document text
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/219724.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/aia6hbc/gibbets_2_bow_arcade_puzzles.pdfIn PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/labuwesusuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5fe30afda9cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_60315c976690b.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ejfNUji/zombies_zombies_zombies_full_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ijbjgPa/78179258898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_603e77411550d.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://s3.amazonaws.com/zalomi/how_do_you_work_out_exchange_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979bdf1e-1cfd-4096-8a1e-9f5ba722ab23/4718860129.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/sedijaletavafogurunin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc3eb10-d9d5-4f58-8f20-7c7f5324af66/maxikigemaponedel.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/examples_of_operating_system_and_their_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e648c7-6126-4e1d-9c60-a74decdd5dd8/ps3_wired_controller_work_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/sq8_mini_dv_camera_manuale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30635dc5-a03a-4ace-8d1f-31730d25e426/53425600316.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/janolun.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/wenorej.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_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 4780 bytes
SHA-256: 46ce37f730cd4157d2def034fc8060d051470242f476609ada57572ad179c858
font_01_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 11000 bytes
SHA-256: b6bbc19cc119c19f062945e3331232e4ab538bb236e153de7a8fa8f9c097fdf5
font_02_sfnt_off00015cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3