Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91aa37b4de78385…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 02:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba571c8660a2aebd24267e6411e702c6 SHA-1: 54757e3f00bee2b9df316fb74fcbf843c5a0a396 SHA-256: b91aa37b4de78385b8d211f2f1c4d71657244cf0f69256d412ac9d6a6f0202b0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=how+to+compute+dividends
    • http://trynutra.shop/5801768239461izn.pdf
    • http://kfnwejfnkwheklf.space/najeeb_members_area_loginm4ra8.pdf
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/rodobisaguvegizem.pdf
    • http://amsidgi.xyz/dragon_quest_builders_2_farming_guideqthq2.pdf
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fe4f30866b6b.pdf
    • http://study-english-04.space/44566011371w1rfk.pdf
    • http://pro-gram.pro/jutudop2rla.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fff314bdde43.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6054f2d569a48.pdf
    • http://smartline58.ru/83620693072druxx.pdf
    • https://cdn-cms.f-static.net/uploads/4454546/normal_603b652b62f08.pdf
    • https://vufomugivubi.weebly.com/uploads/1/3/5/3/135350936/3437721.pdf
    • http://fionainthefield.org/how_can_you_tell_if_you_have_viral_or_bacterial_conjunctivitis0qqul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c073d70e-02ba-456b-9b41-1990a8396c1e/dragon_age_origins_class_change_mod.pdf
    • https://uploads.strikinglycdn.com/files/c09ff135-8c37-40d4-803c-747502234a03/14691250728.pdf
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_d45505b94fd5409a8cebd567b1b60d24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3912dd9-7a41-4e01-9b78-139b6aa937ab/best_marine_biology_textbook.pdf
    • https://uploads.strikinglycdn.com/files/e439db67-1b23-4d4b-ae46-578a9af2748c/86173689986.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_ff72f65478404233a733c3ea927f7185.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b213f4a3-7651-4e1a-8d36-577e6cfaf691/40762420610.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_edf5e4377a424bf6a2ccdc379503d1cf.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_6724c338254c49808974e7e72e528a61.pdf?index=true
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_843087c8f7964240a7da742416a7cbc3.pdf?index=true
    • 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_off0000fcc3.bin
550db163b9ba87c9f7209a14e959acad7062d31031575e3ce2b3795c520d5704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 4992 bytes
font_01_sfnt_off00010dc6.bin
ea43850f872b6725aaabd2ff634907b2540b8e051fb38c4ee740ba6e04729f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 11472 bytes

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