Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e37e173bbe81ff8…

MALICIOUS

PDF

97.3 KB Created: 2021-03-13 22:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2ab2b3bf70e5faf0f01ac263680a4f2a SHA-1: ed45ca46ac387053fee053f03da4e36fa59121dd SHA-256: 5e37e173bbe81ff800e4d48b140bf8b961576b0ff0536db0787b8005d996a825
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains a keyword related to a search query, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=assimilation+and+americanization+apush PDF link annotation
    • http://vukofalizukulo.22web.org/62866695661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421614/normal_603b39fe95b26.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/hiibxjf/.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/tGTEmgc/ninja_turtles_bike_stickers.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/genezifom.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/eI5EEij/the_new_gate_shin_proposes_to_schnee.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/lhbiJgi/nuzukazaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/3iijsif/petuxov.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/Hhbjbic/tuning_fork_sound_healing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5ffd7e4a53a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_6021f9959313e.pdfIn PDF document text
    • http://guparob.mywebcommunity.org/48656213588.pdfIn PDF document text
    • http://bagodipab.22web.org/pasal.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/svLVxgf/34102562283.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/le_role_de_l_assemble_nationale_du_sngal.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/gutegavejidewataf.pdfIn PDF document text
    • http://rofaxemapup.iblogger.org/american_association_of_blood_banks_technical_manual_18th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fdde1885067a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejarisiwudu.atwebpages.com/7544515840.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_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 5352 bytes
SHA-256: fb5eaa8a8fb23be6fba288d522f0c73d8833a253ce1d2516e71673eeff56fb7e
font_01_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 14136 bytes
SHA-256: a03918056138a34530eb0579998d1d5526ea05550740a233c04e5ee06f075097

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