Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf041edd6fc67354…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 03:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b08e800e2407d158f325f35498857cac SHA-1: cced83f0b4df95bdeff3a0e2db7ade4426bce54b SHA-256: cf041edd6fc673549b817ec2d8cfaa1bc1b9412066573176f1946b6665f75566
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point to a pattern of hosting potentially malicious content. The document body is unreadable, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb786f789---3264776439.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lirare.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/42302018197.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/67459696181.pdfIn PDF document text
    • http://mgrima.com/files/file/15129866780.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/75891461343.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/86946337645.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/nuwukin.pdfIn PDF document text
    • http://chemicalengineers.ie/images/44981974613.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/vimilefudewatezaxotadoki.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lilupewupopipove.pdfIn PDF document text
    • https://olterus.org/contents/files/zotef.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904130909_523459965.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vizulisirixepiwavewir.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/61771476653.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/2424555744.pdfIn PDF document text
    • http://grimastone.ru/files/83345319545.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/92747069446.pdfIn PDF document text
    • http://net-work.cz/data/file/giwarixewitadabavinukipak.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54706055516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ubah+font+android+seperti+iphonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 17548 bytes
SHA-256: c448a2afce3070b45f113689df9ea31907c635a9c7cbb5df8affb4d2d7bad23e
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 10696 bytes
SHA-256: 1f980f286df4e07de8193959d8e3fb6f906005d29c3ae30adaa43d6723a5612a
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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