Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a27fc9dc32583f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-13 09:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b288b1800d048935d0cc3e8cd70169 SHA-1: bcd256f00ffbda3dfdc070f0660f588081cea4b4 SHA-256: 88a27fc9dc32583f94b8fbcd4ecfa34886c274846ed83884b3ffe988ba8d2aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, including one pointing to 'seumenha.ru/strik', suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=cisco+command+switchport+nonegotiate
    • http://rirenanevigi.22web.org/zurenokifidagikemafonol.pdf
    • https://cdn-cms.f-static.net/uploads/4413468/normal_602f371b58657.pdf
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6019596a980a2.pdf
    • http://tetufava.iblogger.org/ruxolomo.pdf
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd6edbc7830.pdf
    • https://cdn-cms.f-static.net/uploads/4470524/normal_605d96738f2fa.pdf
    • http://kulilezew.iblogger.org/russian_alphabet_handwriting_worksheets.pdf
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fc738e25c87e.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fe6cb51a34c6.pdf
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60116ee9e6de3.pdf
    • http://xazupadapafow.mypressonline.com/kemafubotizapane.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_601e655ec75e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ligole/intermatic_timer_trippers.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_9f703a448687411e89bd6de813d9c84d.pdf?index=true
    • https://s3.amazonaws.com/kezemiradigu/11320746365.pdf
    • http://pojozija.onlinewebshop.net/tibubow.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_0e9edfd385034187a24da6a6e05017e6.pdf?index=true
    • https://s3.amazonaws.com/goviwigax/solving_by_completing_the_square_worksheet.pdf
    • https://s3.amazonaws.com/futamo/intermatic_sprinkler_timer_wiring_diagram.pdf
    • http://sivumokevidosib.rf.gd/ielts_listening_test_paper.pdf
    • https://s3.amazonaws.com/pidufozu/zomilolimonewuzekow.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin
3e24cfe61b554d38a97a2274985606b6b4977669467e71f06d33d7bb7ebdcbd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5452 bytes
font_01_sfnt_off0001027c.bin
7738931cb1c4a981d0de43b8fc8e8e43044edfb76c49c01e9f15f2ca0e31cf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 10992 bytes

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