Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bf4462b45205cc…

MALICIOUS

PDF

84.4 KB Created: 2021-02-28 20:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6b7871b95cc54f8ba79b01c8e57f3f92 SHA-1: 388f52a3543b1889fe3f7eaf9e10f2ada029abd4 SHA-256: d7bf4462b45205cc17755741ae0bc79c569c88b896b25d20110d748e3be75a53
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external URLs point towards a phishing or malicious redirection attack, likely initiated via a spearphishing attachment.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=togepi+plush+backpack PDF link annotation
    • http://spain50off.info/what_are_the_court_cards_in_a_tarot_deckaz350.pdfIn PDF document text
    • http://doctora.club/gixedafegefanavefvy8gg.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/1bae0cacb96b.pdfIn PDF document text
    • https://powirubojeti.weebly.com/uploads/1/3/1/4/131482959/rabakinazibule.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/JRhbIjh/nick_cannon_girlfriend_2020.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/nulagoxatofuzijej.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hfQtF14/pac_man_world_2_ps2.pdfIn PDF document text
    • https://cdn.sqhk.co/wezikinupig/dThcahc/kobe_tribute_at_lakers_game_tonight.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/rodiligarexo/vikasiwifiwepobetoxovovil.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/sejatedeluvox.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/babbu_maan_sharata_new_song.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/chrono_cross_strategy_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/2020_sea-doo_service_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/bb_racing_blitz_mod_apk.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_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 5252 bytes
SHA-256: 1e2fbb75b19111398a34cf5ca068a1b322ea3f751205855b08c90147cfa3d3ac
font_01_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 10376 bytes
SHA-256: f66f9e6082fdc529f761e8e5f37cd32fe35fe02606cbbaa399abe01be72e3866

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