Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa97668f5b31d3…

MALICIOUS

PDF

79.1 KB Created: 2021-01-18 14:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 73aaa5c8af0a1a6e141e57fccbc60da8 SHA-1: 9d3851a63f09f6cb87034bf2022a956424f60e9e SHA-256: 1ffa97668f5b31d31f14d171238cc92178ec0a44268e23d2d75c11f480db1960
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://traffine.ru/123?utm_term=pathfinder+kingmaker+cleric+feats PDF link annotation
    • https://cdn.sqhk.co/lusimalifa/LRifo4u/e_tickets_live_nation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fc1d6b7c36dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5fa5780f20e7a.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/792d8bbb9b9.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/bPjdNh4/dwayne_johnson_movies_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5f9935fa7a766.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/RjfRjja/christian_word_search_puzzles_for_youth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f8a65b0aa0ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fc3b64e7a2e8.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/BnNggha/gofelemim.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/1270085.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/virafegoxor.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/jegawijox.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/2348252.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/lubiwusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toguvaju/a_child_s_prayer_lds_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/dazufovetozakugupoto.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/hypothyroidism_in_pregnancy_new_guidelines.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_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5500 bytes
SHA-256: 995624f01418de10c66a4479d1bb3c2dee4b9cb198a35dbf04b3824607e9f1af
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10240 bytes
SHA-256: f2d1dce218b61899fb35df9dc2487225fdf3a42c5bf4e2f369d74b5c66c492a8

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