Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa95b1cf45e83594…

MALICIOUS

PDF

74.0 KB Created: 2020-11-17 12:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1cfa63e8ba9165df736b06786551c97e SHA-1: 24a5f8b025e092d97b6a1cdcd0390ffb1484cae4 SHA-256: fa95b1cf45e835943d2b2c3738698dfe06104dcdff38a7bd6d6fe454bb2a93fd
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 0.9997

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://trafftec.ru/123?utm_term=follow+up+email+after+career+fair+subject+line PDF link annotation
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/af05e0ad9b14.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/nobudogijimuwon-xifide-perapumaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fa5eeb0de6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fad5ebd3b9c2.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/d98de1e087554d.pdfIn PDF document text
    • https://kinumonitebira.weebly.com/uploads/1/3/4/6/134605003/gawulex.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/5635cf.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/gupan_wufovalejelinat.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/7d7b229bc.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/43616ff9-be35-496b-be1c-fa2be90c9b7e/elementary_differential_equations_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60794fee-6089-4000-8ef1-a2136f0afc28/legit.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/nodomewaluvexozesikizada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c3205f-da3d-4d4d-bd88-b3150b1a5d91/56744332829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55206b09-be7a-40d6-888e-eab475916756/forest_avenue_elementary_school_hudson_ma.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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 5308 bytes
SHA-256: 9138fcb60ffbab067c0769b9f912680936a9c4ac4ab0a25d312ba986bea68d54
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10792 bytes
SHA-256: 82ed25329de0c98c521bcd0c33926fceb1b6738bf6ecab8bc01307089babe318
font_02_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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