Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfa1e2aafeac481…

MALICIOUS

PDF

73.4 KB Created: 2021-01-12 11:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e4e7545d6ccb9f335c7d23122bafbb3 SHA-1: 7a0608519d9baba2676e49e49598616b559475a1 SHA-256: dcfa1e2aafeac481b63ed9c2b7b02902b9d8e8ee4b66e9c86b88a1b655750788
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Costco google wifi' and 'wkhtmltopdf', hinting at a lure for potentially fraudulent deals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=costco+google+wifi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453734/normal_5ff5b821a84d2.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/0ab062e4aafba12.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/kobuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fb6ef089ebc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fba0eec75cb3.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/TtdgI3N/91722807469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ffb8315a6fa3.pdfIn PDF document text
    • https://site-1168312.mozfiles.com/files/1168312/wood_cutter_machine_laser.pdfIn PDF document text
    • https://site-1174029.mozfiles.com/files/1174029/early_black_friday_deals_2020_home_depot.pdfIn PDF document text
    • https://site-1175091.mozfiles.com/files/1175091/39106762389.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/tesodagiwor/tuburuxugipuwofarovavi.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/500g_to_oz_butter.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/wotudufiroziginedoliken.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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 4740 bytes
SHA-256: d9542c33e9c6fe9eb1b9bb7b417f44f409e063b0498c495acbcfd429c034ac3f
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 10560 bytes
SHA-256: 74a6eb0e5c78dd56e0e8f26fdcc5b6154727791d3c8a22c0c8c338762eedf439

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