Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcf85e4544c4669…

MALICIOUS

PDF

71.7 KB Created: 2021-03-19 12:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb54052559ab52b9f08e1151a3dc5bfd SHA-1: deb774ff6d69f40c672ffdab4f223d97a74bbd83 SHA-256: 1fcf85e4544c4669b0f5a7f7e02cd72477dc3f147a1d406ebe4fee7098078a36
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates a phishing or content-luring attack vector.

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://golowaki.ru/award?keyword=callan+method+stage+4+pdf+download PDF link annotation
    • http://eeuuurrrrr.space/captain_america_symbol_hd_wallpaperoup86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_604872690bfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_603800e880b39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fe261ff4028f.pdfIn PDF document text
    • http://slimerecipe.org/15425376089u1oc4.pdfIn PDF document text
    • http://chatik85939775.fun/13961586478o8nz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601723adf2b42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fc761c528ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_6009d09894f0a.pdfIn PDF document text
    • http://hugertely.xyz/568551079042lvzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_60348868d6c0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fccfb4beee9c.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/vipuxafol/happy_birthday_to_you_easy_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b49dfb1-9248-4a21-91b7-33857464f1df/zezotedepezizufokirebum.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/was_the_wine_mentioned_in_the_bible_fermented.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9038a581-f52e-47f1-a3b1-818e568e62a3/a_firm_handshake_band_members.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3c0648-a835-4f5e-9f34-1d3f9e27b065/what_are_therapeutic_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be6288d-3af1-46d4-b23e-3c7494d53c37/how_to_reset_sansui_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24301ad8-1052-4fb3-86a1-707855718fd8/panasonic_toughbook_cf-53_price_in_india.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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 5444 bytes
SHA-256: 0a35f7779541009888f2817292d356987e66eefec31f855334f9d01e43746d07
font_01_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 11916 bytes
SHA-256: 40948b1c59fe10e9f3d034ceed99ca4ef7612dbbfc00d3e9ae3d508b3c49653d

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