Malicious PDF — malware analysis report

Static analysis result for SHA-256 252b840098520bd5…

MALICIOUS

PDF

70.9 KB Created: 2021-03-15 15:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 39ceaa1456554a2bab0816cce0d96f7a SHA-1: f044018c7d7d050625e867999a4abc54770044e5 SHA-256: 252b840098520bd5b7ec0b28e65cec2471d3adf3a35012a7a8123f68c30b03fc
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, https://midufefew.ru/strik, appearing to be a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Campbell hausfeld powerpal air compressor manual', indicating a phishing attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=campbell+hausfeld+powerpal+air+compressor+manual PDF link annotation
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/9585038.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/40004edb8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_600a8433ad222.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/gcdgfoE/rogonenetuvimawiriv.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/geidjhu/tezagutadirenavusixadavaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5ff17f9052a67.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/vovosegixesafe-zutisi-tasaduja.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/0f4c668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fcce59c07762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_604a26a108c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_6039224282a4f.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/pijabozufegilejemiwubulam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fdc2b2-bb84-4e65-a114-6ea178aef852/92817694525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a805cf6-a250-41d1-a537-aef2ee33a93e/king_kutter_xb_rotary_tiller_-_4ft_tg-48-xb-ok.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/xorifivabedu.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/93151136757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c103db-91ee-4541-948f-aafcd35f98b1/corian_countertop_dealers_near_me.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/15619408101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6cfab8-7483-446e-aa95-44603e033f00/tediloruponogeve.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 5532 bytes
SHA-256: 428199b25adfee675d216d96dd0ccea011be7c3fb9f8873215c8c3ff4f4cd80e
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10348 bytes
SHA-256: 71ba292afb734d1ede77943b02a48c7f9b92a443dc6e5c5d90db1bb2c9002b5a

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