Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3d8d6ec122609…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7a1c54243e7d7b8390301835d56df44 SHA-1: 5c6b86612ef57832202abac750be32eb3a5f9f55 SHA-256: c9a3d8d6ec122609ced59233ed392b1a0bb1b2c443951cf4ecd690f14a27e103
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=watercolor+pencils+techniques+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5fe53d8824fa4.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/tejunidab-jipefexezitub-mofokopiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/wiji7ji/zeferanawinelifuwopalaf.pdfIn PDF document text
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/4e4a5.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/tidubeminosasalixuvi.pdfIn PDF document text
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/fivefoxuvavow.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/d9Gge7K/printed_cross_stitch_patterns_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/9hjshay/thermal_bluestone_patio_patterns.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/gopezifijutorono.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/rqjbIhj/lifulalulim.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/mukivitone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_604cdda192d4d.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/ayushman_bharat_rates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_600ebc557c458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_601b7770c05be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ffb74b7c80aa.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/blackbird_fingerstyle.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jct2hj7/perajagovunira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_d8c309dae2194a75b90ccc8fc1a60422.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_3026524508d4496aa74821bbaac92cf9.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_78c80451fa5c4688ac728857a47b8528.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_09c26360cb154d4688812d62b97b36f6.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_21d1a8f8a2604835a54f5643577c130e.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_97157a8b2993404693d5062cd4686e0f.pdf?index=trueIn 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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 5384 bytes
SHA-256: bd3692775050954339b70f2b80c8732a7945911f5f186c96b0d06adadc2d4e6e
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 10936 bytes
SHA-256: 4aa3ca19f04de352a814a21c43791eb8a76411b55d963c8ed7dcca2e03b2efd4