Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa08e28155b91040…

MALICIOUS

PDF

72.3 KB Created: 2021-01-04 21:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5117999a3ebbb7beb41266ef19e94740 SHA-1: 06223680efeebd8af31bc7471ece14cd6ab8a8ff SHA-256: fa08e28155b910404abf2c72ce2df6bd6cf9946f092700d1a0e86d6bbcf37c0e
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://trafffi.ru/aws?utm_term=killing+lincoln+movie+questions+and+answers PDF link annotation
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/7281119.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/dezomonuf.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/wuzokesasobaxonimazi.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/8039758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f8dfcb9eb7ac.pdfIn PDF document text
    • https://xiravitufe.weebly.com/uploads/1/3/4/4/134438949/cf10edc.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/sikukonisi-datikunomes-mexasusovase-rarabamijob.pdfIn PDF document text
    • https://lapedifulijep.weebly.com/uploads/1/3/0/7/130739603/0b5702a920a.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/d22475ed-d917-452a-915a-bdd6ad95a237/june_2012_physics_regents_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da518a05-c748-4021-a7cb-c6d550e48afc/detixasedep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772039aa-d963-4726-821d-1a8076d59563/44374706379.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 5504 bytes
SHA-256: 2fa05e3faea0511829647c523c79b334f4ce38076a18f5e7ec39046da41d0932
font_01_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 10376 bytes
SHA-256: e7f1c1f4468615a3feec81bb9ae39e20efc2dc0b6eb51e955153baec602fa16a

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