Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53189fb9f69a33a…

MALICIOUS

PDF

77.0 KB Created: 2021-01-14 15:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b1a991444a4355680b83fb13d7a6382f SHA-1: ece9f3958945569ad0c28f3fef8f14fdca445648 SHA-256: d53189fb9f69a33a256ff23cbdc3cca26362207fee56be8fa94201cd82929b2e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=skech+bluetooth+headphones+manual PDF link annotation
    • https://cdn.sqhk.co/wixexozesila/gegdgeM/free_pinball_games_for_windows_10.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/dunijaterufozodovoxarub.pdfIn PDF document text
    • https://site-1176918.mozfiles.com/files/1176918/rojezefamawos.pdfIn PDF document text
    • https://site-1176114.mozfiles.com/files/1176114/sstar_fall_river_ma_phone_number.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/92673738944.pdfIn PDF document text
    • https://site-1172900.mozfiles.com/files/1172900/art_of_war_last_day_mod_apk.pdfIn PDF document text
    • https://site-1168052.mozfiles.com/files/1168052/8425037563.pdfIn PDF document text
    • https://site-1226593.mozfiles.com/files/1226593/93960391441.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/pavufexoxuzogosubozexijig.pdfIn PDF document text
    • https://site-1178419.mozfiles.com/files/1178419/sadixosi.pdfIn PDF document text
    • https://site-1172418.mozfiles.com/files/1172418/39649614257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fd61360c70dd.pdfIn PDF document text
    • https://site-1178278.mozfiles.com/files/1178278/dojufopimuzigapevekipalem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5524 bytes
SHA-256: 443cc14a7e6474db445dc20dd6caba086bb082097093902127726ad4b2609426
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10920 bytes
SHA-256: c29fc68fbba546b6b77e16aa350c94f7aaed64ea97966c310c584bb7f7fa8ece

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