Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5443150df775fd…

MALICIOUS

PDF

76.5 KB Created: 2021-01-18 10:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 458a71df5f7fac15c41037d3a0fda4a1 SHA-1: d9bc66120c0ef00e8f236b4f10563e1de1c5e83b SHA-256: 7d5443150df775fd38bc3b35a051a5e59fd6d0e05ff1f3108ed39f41137fe480
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on platforms like Weebly and CDN services. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=atlantic+goliath+grouper+weight
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/304a99417351d5.pdf
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/bisagaduso.pdf
    • https://cdn.sqhk.co/wavagowew/geweOWG/spiritfarer_wiki_gwen.pdf
    • https://cdn-cms.f-static.net/uploads/4424672/normal_5f9ba9cc80e91.pdf
    • https://cdn.sqhk.co/wibafozadil/cgcIu2Q/power_bass_subs_review.pdf
    • https://cdn.sqhk.co/lanumakefu/Piijji1/54512670574.pdf
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/lefebagi_tigetusurobefu.pdf
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/f43d43517fa4ecb.pdf
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/roxowegeboxesom.pdf
    • https://cdn.sqhk.co/rubekafux/jfgf2jf/wuwoko.pdf
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd9bcb9d2998.pdf
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5f95bee649fed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojaxub/nujunarose.pdf
    • https://s3.amazonaws.com/wupixufekijax/present_form_of_ar_verbs_in_spanish.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f7.bin
b72e11e58dd66bd7c8759a4268a9ae09a8335b5836222b1f6ed3d9704e798b00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 5100 bytes
font_01_sfnt_off0000e459.bin
8c25c0de20f4ad69d1af75daa1c85e5fc73d221db2a406554aa7adf89d51ffef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 10120 bytes
font_02_sfnt_off00010724.bin
73c4c45902b2d69f9f56fb81216f34ed7e809cf48420c774f325ba8f14b351f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 18744 bytes