Malicious PDF — malware analysis report

Static analysis result for SHA-256 62397cfa4366336c…

MALICIOUS

PDF

70.0 KB Created: 2020-12-14 18:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 810ac508d26bb1cceae21830175b1f04 SHA-1: 1bdb61edaee1106567de3c0c125a245b485bb213 SHA-256: 62397cfa4366336c7182ea92f3629f560113a2bae3f1560d4c4145495001b213
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign content, but one critical heuristic identified it as a PDF SEO link farm. The primary external URI points to a suspicious domain, suggesting a malicious redirection or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=when+a+firm+increases+its+output PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8712d7b1c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5fd3b2c17ed90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fbb26e2151b7.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/7726042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_5fae933e73184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5d031084698658e80009c/t/5fd17f677cf94534dc529dfa/1607565160997/billie_eilish_everything_i_wanted_lyrics_explained.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115278ef7301f8b11bee7/t/5fc513bfa97599144e9a1bfd/1606751173493/liftmaster_formula_1_garage_door_opener_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25afeb9-6198-4158-9cb4-8a12c1ff4b7f/29139180823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8416d9b-25dc-40e7-849c-792eb7f82bbd/kingsman_the_golden_circle_english_s.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59d49ee0f32b874afdc5/1606375900888/temogekolu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d35cb8467722f1d3edf7/t/5fc8596f26a3037b43390138/1606965616016/nidugosanuzefiregimi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0e8fde434d6c8f04db88/t/5fd19f2e7c12252903f04b60/1607573299742/45940647788.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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5236 bytes
SHA-256: a528683c8358051877e461595c6ce27e0e8c66c4d85be68ca7be596a3eec2380
font_01_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 11016 bytes
SHA-256: 4bb1acabf58c8fb8019054338ea26b10498556c02fe2cd76de1072daf9278e7a

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