Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25978a22265ac30…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 18:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c63bc183cff89f027a0fca5f2cc7cda6 SHA-1: cbc0972bdf6fd09d4cbfe1629f24562aa0c8d12f SHA-256: a25978a22265ac30e6660f9c54c6ecfefa08caab1713a6a301acab461246bda1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://archism.ru/uplcv?utm_term=active+versus+passive+verbs PDF link annotation
    • https://durgabas.coop.np/ckfinder/userfiles/files/notemuzetu.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/befutakapasijumubol.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/77674415784.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/wejudoverudita.pdfIn PDF document text
    • https://aildf.in/userfiles/file/viruzudawududaw.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/fisarajisewe.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/59666842554.pdfIn PDF document text
    • http://zenithmetals.com/files/xofuweje.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/robuzefugopuvezumifovari.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83027925687.pdfIn PDF document text
    • http://wdnederland.nl/file/zazobew.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/62193963221.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/vopozap.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/zinokavemajati.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/88833364722.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/52372401507.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/jevonobosijigitiwigeluku.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/55310950187.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/kapikabiwab.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/budujowutotakanav.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/faterogejidaremobu.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 15636 bytes
SHA-256: 9355c64298362a00c177f2c07b6e9846d08095f7d9cd1147086692ffb5b7aac2
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10384 bytes
SHA-256: f53ae98b6887024b28fe5cd34a709e29d3d7d6d210501e4d417d66bbcef3b100

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