Malicious PDF — malware analysis report

Static analysis result for SHA-256 338a3ef42ea2ab15…

MALICIOUS

PDF

81.2 KB Created: 2021-10-05 00:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a08f29af7e2f1f4b50e416359104be0e SHA-1: 21b18fec4074f50d37d80f9aa84afa7e4362ca89 SHA-256: 338a3ef42ea2ab152271218a10998d7dc53419548492e476f68046519497857a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on various domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though obfuscated, are consistent with exploit delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://dobrejaja.com/Upload/file/sidavufapisenologete.pdf In PDF document text
    • https://taxforce.nl/userfiles/files/12077818249.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615453c0d09f9---51404324172.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/68464537116.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210924_024544.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/fadozexujekov.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/bovapezolumev.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wiwuxiwusimekud.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/43025589344.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/72170940671.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/25910309144.pdfIn PDF document text
    • https://mcsfood.com/images/file/befelozarudozuxewubogibag.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/15643362496143fad6d3537.pdfIn PDF document text
    • https://thehouseproduction.net/file/mulolokamo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/53561450634.pdfIn PDF document text
    • http://ping-property.com/user_img/files/16556138341.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/lowilakonuboparavife.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/91131056234.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/55655252042.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/48084795889.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/tiwijabafaluzop.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/69067898208.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/fiwawejapufemaxixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=social+distancing+new+world+orderPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 18868 bytes
SHA-256: 07fff82e8aed53d3b6e87f1cd36842d4575f9d80fb1833179653e51628bda437
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10708 bytes
SHA-256: ba8b8a76e790dcd0f398b1b745dcbcf122e5d780cc7cfc669da7ef0f25e78ae7

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