Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a08840f4003ccad…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 16:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f1b8f9742496a90a6bfb3d88044d6db SHA-1: ef047ba841501da903cedf15f070b4f76bffe17b SHA-256: 2a08840f4003ccade493bd76b6bb858365c112603f558647cb5ec868d4f30ad7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=iflytek+android+download PDF link annotation
    • https://sabunwangi.com/contents/files/noxuwukemusareno.pdfIn PDF document text
    • http://recviem.ru/img/upload/93568041186.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/liritizefuje.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/51460494566.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/ruxojenavuxifaf.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/pagawugi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e9119f9bfb1fa4e90497eae0eb25eb4d/55007260017.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/97041669836.pdfIn PDF document text
    • http://bulmarconsult.com/files/vojalavavefawegopeta.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/dizeliro.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/mesitejelapufik.pdfIn PDF document text
    • http://abc-tel.ru/data/File/86584210456.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/62896031504.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/28071350039.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614042e0dc4ef---magigexogajefi.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/wevadepoweri.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/nuxefameteletapoxegol.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/98113314803.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/73398952858.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/86360267259.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/53014914503.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 10424 bytes
SHA-256: 56d56a5b4215edc563be1dbd2e279206a140a8d1d15c4414feb8e1e74c447d95
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 18348 bytes
SHA-256: 4365a3ef85ff38ec7caa105d1f6f91e170b4bdb2da18b5b30c3e3cc7e63d0664

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