Malicious PDF — malware analysis report

Static analysis result for SHA-256 3331e60e5fa74818…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 02:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0ef63cdbb1dbca9a2b2dfedadd52fd93 SHA-1: 1bd564e48dc67c97756de1d0fe1e6d133ab034a0 SHA-256: 3331e60e5fa748181dba7985491481ef9c7975621da93bac068db30d387a4c57
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one that appears to be a lure for 'Speed queen commercial washer customer service'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The presence of embedded URLs suggests the document is intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/123?utm_term=speed+queen+commercial+washer+customer+service PDF link annotation
    • http://lnstagramverifiedsbadgeforms.com/775874474857zywl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fca91533e446.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/watexixuzojeruw_xirujep_pozozowetoxuguw_likiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fdc4ef28d3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_603a6abc7e579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_601f29ad24a39.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/nibajapakeru-noxujigu-jibopak.pdfIn PDF document text
    • http://avit0.cc/13804861161550y2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senapofo.epizy.com/93319499744.pdfIn PDF document text
    • http://gosonuvubunevo.epizy.com/28372522233.pdfIn PDF document text
    • http://barodifa.rf.gd/how_to_put_a_storm_door_on_a_mobile_home.pdfIn PDF document text
    • http://xalesikejuxo.epizy.com/fisheye_lens_camera_apk.pdfIn PDF document text
    • http://jekabuwof.rf.gd/simujizikeboredabebi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/instagram_dark_mode_android_9_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/bukukowupewulosuvemot.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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 5696 bytes
SHA-256: ad0c688b6dd204ac662bd030b4ad94bf22659dd05c8e84a4227a8a2395db2f59
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10784 bytes
SHA-256: 3585a18419d27760d1c8f91829ba45c2c6f0ab1687d79b2f89229ba2c5efde09

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