Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b0a820b4038f81…

MALICIOUS

PDF

79.0 KB Created: 2021-03-25 06:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56fcdb96a4ebd39152da3c0230caf8a8 SHA-1: 274e8326cf42cd32b0b50fae1cd442bb0b9c6489 SHA-256: 75b0a820b4038f81e23f8ec2d425c7d550c6cd85344cb35362ceafc88946b231
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/wix?keyword=appvn+apk+latest+download PDF link annotation
    • https://bifezogutagu.weebly.com/uploads/1/3/4/5/134598372/kugewexus-zosifogotusozu.pdfIn PDF document text
    • https://nubizuvilokimid.weebly.com/uploads/1/3/5/4/135401099/f8d97b5.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/486754.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/pifufumaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_605c05f365146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_600d63ff7e8db.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/musomo.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/numonepewubuvus.pdfIn PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/78e7e9e9234.pdfIn PDF document text
    • https://ronafipilegov.weebly.com/uploads/1/3/2/6/132681204/kizexagebogawitijafi.pdfIn PDF document text
    • https://fafexozoruxefok.weebly.com/uploads/1/3/4/5/134527426/jisudije.pdfIn PDF document text
    • https://lorivomewojesab.weebly.com/uploads/1/3/0/8/130813497/jemifizaj-banipuf-wexoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_6055bb1a2a5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1375ed-def5-4527-8625-b76c9ec81138/what_effect_does_cooking_have_on_enzyme_activity.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_221b774850094d2f845e2aee8f5b14a3.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_1b9dfd76161c4df4ae9910f7fe4a0f74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56712fda-88cd-47af-92c0-3c73d1124250/derecho_romano_rodolfo_arguello.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 5064 bytes
SHA-256: 206afd720ba94e319ab9a256992cd531f9e10ac457b1cf6aadc7c5ea7fbad591
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10852 bytes
SHA-256: 3a916c461ad0384b2ec289ab12a282d57c4665da336c4fe9d49e23fcef52e516

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