Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25fc7a52f805c3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 13:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 761545eaba68799b9ac44abfbeb1e311 SHA-1: bc861a4865820d2fa951cbf049b7c3b2d53e6458 SHA-256: 1e25fc7a52f805c33eb304c2aa266e0d38242ff4535b4164cfce8601cbf2ff6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as a phishing lure or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=keyword+research+for+blog+posts PDF link annotation
    • http://daedukgs.com/admin/fckeditor/data/file/20210918082144.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/37781964474.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/90333276136.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/labulavevuxoliwizi.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/57367117008.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/81156997836.pdfIn PDF document text
    • https://manenshop.com/upload/files/33124578460.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/jemamara.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/videkak.pdfIn PDF document text
    • http://indel.sk/userfiles/file/30911721420.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/sizovigafamav.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/zakovusibimarexetid.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/nakerejigalerutuzuduvuto.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/66421088388.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/tamosabifewuvuta.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/46567122129.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hu1o74vhf181uh41adi40rm421/47398100739.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/16850538455.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/jazakinobalinulobutore.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xudemazowa.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/67412451875.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/78464286697.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://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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 17076 bytes
SHA-256: bc7ddc6b77e44c247207fac41e3a494e9b4ef0f3fe15f46417d3c21fdecfae5b
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 11032 bytes
SHA-256: 93440a54fc46dd1141674c2331a7f0479c8d4569a935f0ed26db11ed7428b315

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