Malicious PDF — malware analysis report

Static analysis result for SHA-256 979a8cdc8303ae07…

MALICIOUS

PDF

78.0 KB Created: 2020-12-26 03:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e66ceed6133630370490878130baca79 SHA-1: 558ecf90866086cb7f58c55999792f4c10281f67 SHA-256: 979a8cdc8303ae07b7c61d30683bac1af3cd64063b18a987b857324fe1002f99
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The embedded URL `https://trafffe.ru/square?utm_term=spring+framework+tutorial+pdf+ebook` is likely part of the lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/square?utm_term=spring+framework+tutorial+pdf+ebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5fc497d8dcb9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f872c8f1bb9f.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/3091163.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/zixuso.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/hgeaThh/gw2_super_adventure_box_tribulation_mode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_5fc1465637c6a.pdfIn PDF document text
    • https://keroxazoxap.weebly.com/uploads/1/3/4/8/134884937/3620615.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/ce41b.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/e66d257e-28d6-4927-8159-5ee4f5b569e6/test_drive_simulator_pc_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8673786-7051-46f9-a2d2-ab917773979c/blocked_artery_lip_fillers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ffb12e5-f328-4a8f-ad76-3a402f6d056f/61257698336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029a4327-1ffe-4bae-929f-ffa7420eb2ea/biwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9e5215-1ea9-4805-acb6-19d0c34f83c0/sorigewebujofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bdcca2-d30a-4bc4-8edd-59dcdba0db08/zunago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e15eab-5ae0-4df5-8208-90057e28735b/jirajinenevesomutamumi.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5580 bytes
SHA-256: b26518b1152d0fa1b1cd10fd549223a1acd4f18657e7bb58e1627aa34235b61b
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10748 bytes
SHA-256: 8cb36a716ba3881bc572832c060c707f7c11e6edc1ece0f81a0755fa7c1da123

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