Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c1fdd08f0f12e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 03:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70f756811768040bf2fe5c8f2292581f SHA-1: bf9c3ce0b6a495bf8b054290547fcfa9339b690b SHA-256: 874c1fdd08f0f12e64b34730145c649e9ae8e77b21f778a5c8f71f4b08a6a170
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to direct users to malicious sites. The presence of external URIs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=gta+vice+city+highly+compressed+apk PDF link annotation
    • https://tsegypt.com/file/sejutaronukid.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/33865105717.pdfIn PDF document text
    • http://anpharma.net/upload/files/tetupopasabepen.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/zekofapaxarititi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/mitunebelavizopuxafifa.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/riwofaz.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/rexujasaguwef.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1238840806.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/taxosezigavifizozi.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80970608833.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/ginepabesot.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48b57f85f---bibaduw.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/kefufaxubizejevo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lujoxaveraxedetabasuw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zepitabibelujiviza.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/bobidasoze.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/18692052002.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/16978916523.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce9dc5654---2707548915.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/69817840412.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/19915210592.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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 11168 bytes
SHA-256: 726a4256fdd8a1fb1faa438fe69eb78adfc4b9b4bf4d4dd832afab3eeec2e83b
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16848 bytes
SHA-256: 2d8e91d14adf60879b19360f8c4baeb8a730ebdc687c419825a58fc677198276

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