Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8783db8e7735ffe…

MALICIOUS

PDF

81.6 KB Created: 2021-02-26 07:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0aa2be2357e356cf67925654feef27bf SHA-1: bd4db3a3cd6ea794d72a36c6c7f1b3d43b11cb3f SHA-256: b8783db8e7735ffeae6a259bc4c7d9b1fdef446e96d351636e7a6949aef08560
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, one of which is part of a link farm hosted on disposable domains, suggesting an attempt to redirect the user to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://leonvi.ru/award?keyword=toro+ultra+blower+vac+51598+replacement+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482188/normal_60034c8038864.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/d667883ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_601471a3c6662.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/ce06821222.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/1295793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_6029cdf20d50d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463825/normal_5fe22b096b89b.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/fijhjgj/swing_wire_media.pdfIn PDF document text
    • http://dewexipe.22web.org/owen_meany_chapter_4_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fde92aff06f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://welididoseburiv.epizy.com/zebosoxewugujevux.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/what_years_were_the_craftsman_lt2000_made.pdfIn PDF document text
    • http://turojupa.epizy.com/aha_2018_lipid_guidelines.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_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 5848 bytes
SHA-256: dd4389da6724c80de2dbc00a9f91c945192271a8dd444b8cc1f371db0ffcea4f
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 11084 bytes
SHA-256: a125171758e7d66a83104d75b3f40375d139efea15a405f641386b8e9641b1f0

Open this report in the interactive analyzer, or submit your own file for analysis.