Malicious PDF — malware analysis report

Static analysis result for SHA-256 3794df739c895899…

MALICIOUS

PDF

71.0 KB Created: 2021-01-11 08:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8cc3d12108d4d80df2367182d4027f56 SHA-1: 7ef8284ac8fe57ac46dd21e2abdd5dfd9771f5a5 SHA-256: 3794df739c895899d4a50de3e5762045104a2462dd626e9280326533d2ba2990
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URLs and the nature of the PDF heuristics point towards a phishing or content-farming attack vector, possibly involving embedded JavaScript for exploitation.

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://traffnew.ru/aws?utm_term=homeschool+lesson+plan+template+free PDF link annotation
    • https://site-1168056.mozfiles.com/files/1168056/best_outliner_clippers.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/6fidSwC/92619237165.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/OjiOigY/easy_mini_cupcake_recipes_nz.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/ratisedozexujuta.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/4955525.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Y6xnFGi/original_pong_video_game_for_sale.pdfIn PDF document text
    • https://site-1176572.mozfiles.com/files/1176572/revofana.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/tugumeb/69031363925.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/83055838256.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/pediatric_advanced_life_support_free.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/african_queen_fakaza.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/tilapia_farming_guide.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 5216 bytes
SHA-256: bc442345a85bd806efd4b0766f780a4278d3732dad5fe0f2220a51e5030f441c
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10348 bytes
SHA-256: c2ea883aa8b064361552ee16150e35be85f74761ddec3a01c306cec311b0cc42

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