Malicious PDF — malware analysis report

Static analysis result for SHA-256 f187c6c9f0796b28…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 03:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95a8b059a06116aab6d836e7b92b9f0d SHA-1: a8b3f889c4458465ffa5bb1b94894bc6ddb68896 SHA-256: f187c6c9f0796b28add18cd7b813530435a3fc1a4c0a7219679ca1ade76fdedb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The 'SE_URGENCY_LURE' heuristic indicates the document likely uses urgent language to prompt user interaction. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mlmrockstars.com/ckfinder/userfiles/files/bunofivubutenigopagujezu.pdf In PDF document text
    • http://quatanggiabao.com/images/uploads/files/55046756967.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/4863550147.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/96128346497.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/20445442056.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/25258623666.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444d87a8f1---8609326787.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/1045633103.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/60334716458.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/dofovivom.pdfIn PDF document text
    • http://kd-council.com/upfile/files/punagogo.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lusijorewojaruviwiv.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/gobukeselulofolupolo.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vuxopapajudazu.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vewopixag.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6b672552c4d7473298af7ab96bdb8b96/93300658559.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210909145549.pdfIn PDF document text
    • http://17njl.com/userfiles/files/20691760807.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/tisapolaremoniba.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/8543860918.pdfIn PDF document text
    • http://hidramaco.com/files/files/wajosaxijob.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/61870464852.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/21055495772.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/vikixilivok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=photo+karne+wala+appPDF 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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 18784 bytes
SHA-256: 8292ff5e4c9df6a9f9853f850a1501408c155517fe7ec5fbb49a52c42342972a
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 10268 bytes
SHA-256: 216111739c40a789c2f7f38c39e07f23525657fbacd6475a5d8b6a3ad4e51068
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1