Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c20a45e26c0909…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 02:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cf1f17cc0a32d1a35463fe6f7732fbd SHA-1: b1735c78e6878fb139dacbefbc848e67bb65e09c SHA-256: 01c20a45e26c0909a97d21705f2c3919c8862f310ab49c29550b05f63734ee5f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, which flagged it as Pdf.Phishing.Trojan. It contains numerous external links, including one to zajinet.ru, suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, appears to be a lure related to stroller configurations, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=uppababy+vista+stroller+configurations
    • http://mejuzuw.scienceontheweb.net/verb_tense_consistency_worksheet_with_answers.pdf
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/navibejinave-vezew-vulixu-figumaj.pdf
    • http://jixewelo.scienceontheweb.net/15053893195.pdf
    • https://cdn.sqhk.co/nudofarus/VruqJjj/vevodezeduj.pdf
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/zofuwerakawupokutebu.pdf
    • https://cdn.sqhk.co/sexifirume/gTHhdWs/strategic_thinking_definition_and_examples.pdf
    • http://luwinilulurop.mywebcommunity.org/46484357427.pdf
    • https://cdn.sqhk.co/sixitigoxeto/iAgihe5/36289821025.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nopomewegobij/24981333815.pdf
    • https://s3.amazonaws.com/nosepevozux/35357789660.pdf
    • https://s3.amazonaws.com/gelawiweza/53647415819.pdf
    • https://s3.amazonaws.com/popilo/what_is_incapacitation_in_tagalog.pdf
    • https://s3.amazonaws.com/wusone/zigozemomugevijumojove.pdf
    • http://pekafujojef.onlinewebshop.net/el_alferez_real.pdf
    • https://s3.amazonaws.com/xeropizuwe/67655998194.pdf
    • https://s3.amazonaws.com/kavugusepe/73821596512.pdf
    • http://sivikonalijuto.myartsonline.com/bsa_firemn_chit_requirements.pdf
    • https://s3.amazonaws.com/dorulusof/jotaro_kujo_meme_template.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_off0000e995.bin
bc75aa67b2d5b370cb10d89a491174fd311ded2df402fa878dfc9d11ba76d03b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5476 bytes
font_01_sfnt_off0000fc50.bin
8fe67c82bd6ef858c930ef8537d26f56661d1f6f2414c690e6ff1f9d1586d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 10628 bytes