Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0076abaf3c2f28…

MALICIOUS

PDF

78.6 KB Created: 2021-03-25 02:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf807caf6ebeab7190ebf5572fa7481 SHA-1: 5b7462c3d9ab5685362781ee4285992bd8785d76 SHA-256: 9f0076abaf3c2f287a2ebe1d7984e6040a5125c1d6c91dd52ba39e3965d5b762
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://nipisod.ru/strik', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to negotiation biases, intended to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://nipisod.ru/strik?utm_term=what+are+cognitive+biases+in+negotiation
    • https://cdn-cms.f-static.net/uploads/4392453/normal_600d39f40d932.pdf
    • http://betmoy54.com/silenizotifafopueqay3.pdf
    • http://ruszaimclub.ru/why_implement_lean_six_sigmar1za7.pdf
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/lobutusujuru.pdf
    • https://cdn-cms.f-static.net/uploads/4453906/normal_60478f73c4fd3.pdf
    • https://cdn-cms.f-static.net/uploads/4472185/normal_600a208bd432d.pdf
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/ledaguveli.pdf
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/edb0c8028c.pdf
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/xomagezop-pinawiz-nukajojaguf-sosub.pdf
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/lexigopiju-koralutukig-kubujuvutijerap.pdf
    • http://activa-fb.com/carta_a_garcia_completaonoh3.pdf
    • http://net-klientov.ru/dodge_caliber_-_service_repair_manual_2007_yearqt41e.pdf
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bb70b4656f.pdf
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/ruwetakem.pdf
    • http://wide-do.top/xigajijolazqv6yz.pdf
    • http://circus.market/tepuxisokogeludirezia8p7h.pdf
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/dewugezu-bisapitug-fizofigalezin-rixinosalo.pdf
    • http://hamsterbig.com/56671390036wfc1x.pdf
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/gisuw_vapujotif_pukavujif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fac3c89a-5352-4440-93ad-4be437a79bd3/vapakajedovixexixuzu.pdf
    • https://uploads.strikinglycdn.com/files/0349e323-865d-41c2-8ef6-b1af3f4f1da4/rutelidosumifi.pdf
    • https://uploads.strikinglycdn.com/files/957ae5a6-3266-4bf2-ad89-495b55057634/how_much_oil_in_simplicity_snowblower.pdf
    • https://uploads.strikinglycdn.com/files/5a9e394d-6e6d-4cd7-87ea-dde39fc4c5cd/555274741.pdf
    • https://uploads.strikinglycdn.com/files/a78f6175-5638-4c51-b610-bf35ec5a9e07/79774254217.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e844.bin
c1214d8b98f95c5de1a338a387cebe997d5b7358a1e0bfa115baf6865bae23e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5032 bytes
font_01_sfnt_off0000f963.bin
41ec66ba7b7fd67739587d5bf86b5e975f484390152ed91f6f89f267b09a87d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 11284 bytes
font_02_sfnt_off00011ebb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 4324 bytes

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