Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c307b46199fbc83…

MALICIOUS

PDF

74.3 KB Created: 2021-03-16 10:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbf40d62cef13800efab417f1317b149 SHA-1: 1a0e7f10c3cbca2c9827aaa225382f2de326a32f SHA-256: 2c307b46199fbc8317bf3d7dc2a3a67ba5b1e8a5a8af6fd571a9c765bad83d23
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 0.9999

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://bologen.ru/award?keyword=arsenic+pollution+in+groundwater+pdf PDF link annotation
    • http://zebiripu.mygamesonline.org/pdf_ccna_200_125_study_guide.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/27058242951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fe9aae86efaa.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/eiiicGB/webakukajitaxonomuzijogot.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/hgzpUhc/59406534223.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/bQgfbje/marketplace_application.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/hgcrtgh/dowazezedaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6028b7ece946f.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/gonura.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/eiigdLe/soul_land_awaken_warsoul_tiger_build.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_ce8beefc76874f63ac2cad79d46cc106.pdf?index=trueIn PDF document text
    • http://pedirite.onlinewebshop.net/zebot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483a8519-e96d-41ba-98be-b78a8f023491/38892695866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95276f5-750f-464a-b631-bf3ee72e7616/77063201517.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_b6f660d7263d41fa96aac3b32a98ba60.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_a2148c7b29474e08a736fc2df188957f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/355ec2a0-6d0d-4ded-8bb5-d736bf6dda9c/warcraft_3_reign_of_chaos_game_key.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 5404 bytes
SHA-256: 538d358345819575515a1e29cd7f97bb843b89d34a0acf6616e1cf8c01236a64
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10656 bytes
SHA-256: f84500b98cad231243735293de2669a758430f8b0bae97c773f7714b1499367a

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