Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf311c3193d7fc87…

MALICIOUS

PDF

86.8 KB Created: 2021-05-09 04:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26f77de54514acda121dae99791d7dda SHA-1: b9fbbbfea59b704568cd0fbb12d82fffd0cf3b73 SHA-256: cf311c3193d7fc87718fb9bcc028ca37cb1b3ac954a74c91d71f2c88a4928102
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a chainsaw review, which may be a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/strik?utm_term=husqvarna+450+rancher+chainsaw+review PDF link annotation
    • http://mizifasurogik.mywebcommunity.org/seronapisufop.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/wawij_xonaninilagodir.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/how_to_set_up_answering_machine_on_panasonic_cordless_phone.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/44909962714.pdfIn PDF document text
    • http://vapabamulu.22web.org/korez.pdfIn PDF document text
    • https://depovazopalixu.weebly.com/uploads/1/3/2/6/132681382/e406bc08.pdfIn PDF document text
    • http://helpverifybadges.com/51612400446pafwp.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/c51aa0e61bbb9.pdfIn PDF document text
    • https://fifiruzi.weebly.com/uploads/1/3/0/7/130775727/wavadunakofob.pdfIn PDF document text
    • https://jelifamije.weebly.com/uploads/1/3/4/3/134320618/nunokiwupire-vexenunowewov-texaju.pdfIn PDF document text
    • https://pofefami.weebly.com/uploads/1/3/4/8/134884789/9911093.pdfIn PDF document text
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/375830.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/what_are_the_5_strategiesqwhkw.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/44193600839uxo7x.pdfIn PDF document text
    • http://cucoupon.info/69003497254ljscz.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/araby_as_a_modern_short_story.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/43336931484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemunebo.atwebpages.com/26809297396.pdfIn PDF document text
    • http://mezezix.rf.gd/30865430761.pdfIn PDF document text
    • http://vusedew.myartsonline.com/armstrong_4030_pump.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_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 5448 bytes
SHA-256: 5be1a12840b4bcb4c4772da5d1b4fc9e6358e2d6e4467ddba24a2e1cb44bba89
font_01_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 10844 bytes
SHA-256: d4f11be99a36a81a556cfa81b28c4ec9e53a8c37aa5b4689b47c29f43bf7a1f7

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