Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9627fc9de4e0d2c…

MALICIOUS

PDF

84.1 KB Created: 2021-10-16 10:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ffc14746970c4c9acf38256bd4ffcd0b SHA-1: c1f064f0bbceb82d7a88a36a08205339dc02fe6f SHA-256: c9627fc9de4e0d2ceb48e20071d4a0c58b8734bf9c335bfa679ad6c1e1a6fe8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a multi-stage download or distribution scheme. While no scripts were directly extracted, the nature of the link farm and the ML detection point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://tnmetalworks.com/images/files/51042090498.pdf In PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lotakem.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nogeninewetaloxika.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/9630772030.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/fasuwil.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xamugap.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/wamurepil.pdfIn PDF document text
    • https://petikdaun.com/contents/files/wabiligidixuf.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/jirujazobelevinogofawegit.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615645e2e9dfb---21151132004.pdfIn PDF document text
    • http://hospitalitan.com/sites/default/files/file/dosugoko.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/soxefagozuxevugonaveziwe.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/jexep.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090513522068021.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021920157231201.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210916084957.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/35565636118.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158938f4a717---minirurezasedekubijivom.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/74726585958.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wegipizaj.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/67555667743.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xazatafimomiwiviveni.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=engineer+goby+for+salePDF 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10528 bytes
SHA-256: 9dfa4bfd63e75877a09b8b96003d74d2075f9c915ca2dc279962c69a1a8af963
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 17360 bytes
SHA-256: 256199a2b4ca8245e187775b363727cd1550ee3abc1b6ab128917dae6e5e76b3
font_02_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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