Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735ee80c13ce436…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 02:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23356aaa682d81abffa003c18f8cf75 SHA-1: ed12ab5c0b01383c556238ccc21889279c3cc19d SHA-256: 0735ee80c13ce4361cb8cc5151a208bef5a44a86030d0093a80d3b3a4bf19eac
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. The document body, though truncated, begins with a lure for "Frozen 2 piano sheet music free pdf", indicating a social engineering tactic. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=frozen+2+piano+sheet+music+free+pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_60baedbee6319.pdf
    • https://linoratu.weebly.com/uploads/1/3/4/4/134403550/2e31dcc5a.pdf
    • https://static.s123-cdn-static.com/uploads/4406456/normal_6004a58d43652.pdf
    • https://feditesar.weebly.com/uploads/1/3/1/4/131483001/mobuwimelejume.pdf
    • https://static.s123-cdn-static.com/uploads/4408866/normal_5fcd3ba9a3705.pdf
    • https://gukusabijimesop.weebly.com/uploads/1/3/4/7/134761354/xiruzovopopiju.pdf
    • https://cdn-cms.f-static.net/uploads/4381752/normal_605acbc3ac8ae.pdf
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/83bc9746e00b8e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4413473/normal_60b1634d835b6.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_5fe92e7eead8b.pdf
    • https://wajupinafuju.weebly.com/uploads/1/3/4/7/134752356/2bec446ec1432ea.pdf
    • https://cdn-cms.f-static.net/uploads/4457000/normal_602b08e161cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4425933/normal_602edcd42c0a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gorixose.pbworks.com/w/file/fetch/144730056/53171437960.pdf
    • https://uploads.strikinglycdn.com/files/6306d534-9b0e-4d3e-be49-8664d524666a/mobility_scooter_operating_manual.pdf
    • https://uploads.strikinglycdn.com/files/7affb18e-e58f-465d-9e18-e102158d7d0a/pobodigojeguduridenafoke.pdf
    • https://uploads.strikinglycdn.com/files/e60c6be8-3e2e-432a-8f92-d385097af120/how_much_is_a_yellowfin_tuna_worth_per_pound.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144725781/semejanzas_y_diferencias_entre_etica_y_moral.pdf
    • https://uploads.strikinglycdn.com/files/e3e56e2c-b4c3-487a-a7c9-fd75f16d615e/matinafinezegukodafupe.pdf
    • https://uploads.strikinglycdn.com/files/f991f824-9b44-430b-be36-74717c736c89/install_fios_g3100_router.pdf
    • http://kuperuxowix.pbworks.com/w/file/fetch/144539382/36085637001.pdf
    • http://fisojun.pbworks.com/f/76481311718.pdf
    • https://uploads.strikinglycdn.com/files/ce45f2b0-99c3-4961-b9f8-e3c4797b8613/fepobanisipapore.pdf
    • https://uploads.strikinglycdn.com/files/24309e14-af31-4d6b-a3bf-89f026d33799/are_ssa_survivor_benefits_taxable.pdf
    • https://uploads.strikinglycdn.com/files/0e5f13a5-7177-4c1f-9667-e37bdf730a09/48434451772.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin
3b101332da06056b8b56b63c7410ff4d5ed01b79e2222294fdd2b4b8a1fc9919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 5500 bytes
font_01_sfnt_off000100b3.bin
613e228f747ed1dfb91255dbd83307181015cc4b7f82be7c519f6b391fbbfdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10736 bytes

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