Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f578e0c85bdf9a7…

MALICIOUS

PDF

66.3 KB Created: 2021-01-30 16:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c061ce6228f46cea4a3b451aa6d8a279 SHA-1: 51021f45ef4e039d5e2e6482d1054b104823dea1 SHA-256: 6f578e0c85bdf9a7e926aa1da6132c4aba2e33d92e7444525e0a0bfd56b45df9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body, though heavily obfuscated, contains text related to 'Shooters waterfront brunch hours' and metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs. The presence of external URIs and the callback lure heuristic strongly suggest an attempt to trick the user into interacting with a malicious entity, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://baarspo.ru/wb?keyword=shooters%20waterfront%20brunch%20hours PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490974/normal_5ffa4ef20c5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_6011abbca546e.pdfIn PDF document text
    • http://fruittea.space/you_caroline_kepnes_quotesouiwy.pdfIn PDF document text
    • http://winsbig.space/reaction_trainer_for_pubg_free_downloadqgzdc.pdfIn PDF document text
    • http://doorstepcomputers.com/332412544975ow27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xotomisen/zifibulitasikuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/3d_wallpaper_hd_nature.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/ceilidh_music.pdfIn PDF document text
    • http://depevabevidot.rf.gd/zufafetuvix.pdfIn PDF document text
    • http://bawozejowavonot.rf.gd/collaboration_with_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/20974372866.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/mirabirelilulupolu.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/all_information_about_badminton.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 5272 bytes
SHA-256: a602c7a580b49a9270f70b9459a0182c3571e8d14a549426f12e405887823f0b
font_01_sfnt_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 10916 bytes
SHA-256: 7e23ea2d78437456ca7b883c67f4d2cf4beb05b3a62484fba7ad1251d3f30bec

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