Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4e0e64c0e852b9…

MALICIOUS

PDF

82.2 KB Created: 2021-03-11 15:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d0db9c0a9b08f172068169ec84e6629a SHA-1: 07ddebaa6a11ebb05054cb6941676a45d243496d SHA-256: 4e4e0e64c0e852b96120731ce687e1b45a7ae714829a3fa1a727660cf207d64f
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious. It embeds an external URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution domain. Although the document body is heavily obfuscated, the presence of embedded URLs and the overall heuristic profile strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://zajinet.ru/award?keyword=bolt+clamping+force+calculation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445532/normal_6037366e36a6d.pdfIn PDF document text
    • http://ostanni.fun/xovenibipidexid7dtxz.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/ropiz_soneleta.pdfIn PDF document text
    • http://blancer.xyz/honda_fg110_carburetor_adjustmentzbl2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fd1ece09f58b.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/f549c75.pdfIn PDF document text
    • https://gufobetatogeset.weebly.com/uploads/1/3/1/0/131069923/b218a99f1d4a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_603569744de16.pdfIn PDF document text
    • http://mscgis.net/mathematical_logic_for_computer_science_gatebg4l3.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/jifedefujodu/naxupef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ba46b9-596e-4cd5-9372-dcb74e3cc436/60509152348.pdfIn PDF document text
    • http://muviwozusisewer.rf.gd/dewalt_extreme_100_piece_mixed_drill_bit_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201c26ab-8545-4d65-bcb6-35397b9c88ee/85794014749.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/candy_shop_black_font_free.pdfIn PDF document text
    • http://kunubuxeduw.epizy.com/34852237838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34a63d0-c548-4474-a8b5-0923776d053a/can_you_take_a_dmv_written_test_online.pdfIn PDF document text
    • http://sekupudim.rf.gd/motorola_xt830c_sim_card_tracfone.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/1149475758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d4afbb-6992-4b77-97e5-1c789520529e/kumano.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_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 5344 bytes
SHA-256: 14f930c4a3f118ae7aef8a92674db506d0e7fbbd792448d7aa25cae937b0ddf3
font_01_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 12236 bytes
SHA-256: 75ebf83415a0afac6ea16926ba4d350866addcea22e0a999cd9ddbd1db55f196

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