Malicious PDF — malware analysis report

Static analysis result for SHA-256 159968da4cebe56a…

MALICIOUS

PDF

88.6 KB Created: 2021-02-26 10:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e69159430669fdc8f043e576040ec6a7 SHA-1: a34388fdebd685f37b98f48882495c3609b80138 SHA-256: 159968da4cebe56a8a13db910659c2d1c607f4fc1786c9b0e78fed64d33ee0a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

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://jottigo.ru/award?keyword=airspace+sectional+chart PDF link annotation
    • http://womenita.fun/tai_chi_training_near_meavt74.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/icafics/pocket_rally_lite_mod_apk_1._3._8.pdfIn PDF document text
    • http://itmax.info/zetolurugdybq5.pdfIn PDF document text
    • http://car-test.pro/faguravepesuwosizulajkgse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5fe8c7fd7eece.pdfIn PDF document text
    • http://select-get.top/the_ultimate_guide_to_getting_into_physician_assistant_school_fourth_edition4r66m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5fccdff2b1bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_601981f644a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_601b7dca8a387.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/vijurekisesew-zowanapinoj.pdfIn PDF document text
    • http://veronaital.space/955463817865scsr.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/B2GWWgi/nomap.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/gt6qhif/mr_bullet_feeder_die_canada.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/6560755.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/vanatul/giginixexerexudime.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/plus_size_long_formal_dresses_with_jackets.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_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 5008 bytes
SHA-256: 7f09e1266fc26067ac19f404e0e66a74d412fb4454ec17d3b8d796a8af2a4142
font_01_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 10500 bytes
SHA-256: 96dd07ea81a309ae17dfb570af46b379048b2057bda0839752468db3e32b7231

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