Malicious PDF — malware analysis report

Static analysis result for SHA-256 679eb197bd3462ea…

MALICIOUS

PDF

78.6 KB Created: 2021-02-28 14:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 499b6b66e82be59b065ecddeffcebdb2 SHA-1: 8bee7e57fe9673898a44fbf7fd7af4004da9b187 SHA-256: 679eb197bd3462ea0f05dd3a4b240bc5d3a5450eead58eeed023a81dabe00969
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, appears to be related to a tutorial, which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=entity+framework+tutorial+for+beginners+in+asp+net+mvc+4
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/rimisojiladume_vagasekemigi_zefuvowutop.pdf
    • https://cdn.sqhk.co/fojilude/fanDDhh/fuluzujiwowazofelik.pdf
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/kebezibebijo.pdf
    • https://cdn.sqhk.co/kekelivig/hdkgdIu/dozef.pdf
    • https://cdn.sqhk.co/tuseliwi/hcchahe/blackwood_forest_abandoned_house.pdf
    • https://regujimupakuve.weebly.com/uploads/1/3/5/3/135348903/6522076.pdf
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/dumexisizuzivu.pdf
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/b4557a1b53f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gixirojozogufux/31476153556.pdf
    • https://s3.amazonaws.com/jepinebawo/marriage_contract_psa_form.pdf
    • https://s3.amazonaws.com/safago/zexoxopanewibukevarivoge.pdf
    • https://s3.amazonaws.com/budovewesekaz/62800452083.pdf
    • https://s3.amazonaws.com/wonumafubij/cuneiforme_significado_wikipedia.pdf
    • https://s3.amazonaws.com/fekaduvopigab/bmw_x3_2012_service_manual.pdf
    • https://s3.amazonaws.com/suxiweke/nawuniramevubeba.pdf
    • https://s3.amazonaws.com/zetituri/rocky_balboa_motivational_speech_audio.pdf
    • https://s3.amazonaws.com/gopuze/95113341503.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_off0000e44b.bin
812912cd83649df7f8544a84225ba901870848b1213762d65e3727c6c44b9bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5720 bytes
font_01_sfnt_off0000f7db.bin
9f8828c640fbf4684a92b66f2a554cd841687af1934b5e2974a092a3acd0dabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 11532 bytes
font_02_sfnt_off00011e96.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 4324 bytes

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