Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ec61034bd785f6…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 09:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1238a87e8fd09dfd736533b51a505bbf SHA-1: b48768b16947b80e93f26a781111cbe4b97f9d13 SHA-256: c7ec61034bd785f60ee92581e158a7b3ce2d1955e6e9113188a88ba333b24b8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/aws?utm_term=diaper+genie+elite+bags
    • http://perevod-card2card24.site/my_boy_gba_emulator_pokemon_download7ilat.pdf
    • http://vumonivaxozutod.mypressonline.com/51578741311.pdf
    • http://emmetrix.net/721154814084urw1.pdf
    • http://fastpysystem.online/ditasexanoxasupaxejifgo1f0.pdf
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5ffb57c94e63e.pdf
    • https://cdn-cms.f-static.net/uploads/4401515/normal_604e99e4ba0f3.pdf
    • http://varietystore.website/3268702263902gs6.pdf
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff4531099edc.pdf
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5ff3234bc2d48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gakamaxoluzes.atwebpages.com/bafimesojome.pdf
    • https://s3.amazonaws.com/galinikagopit/40897712623.pdf
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.pdf
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_f2abbd2997af488fb7e4234d4cd32ce9.pdf?index=true
    • http://moxuzaridob.onlinewebshop.net/96124793258.pdf
    • https://s3.amazonaws.com/tirimofufemukat/geliguxen.pdf
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_baa6960b1ebe4dab8b1037090f4bbbcb.pdf?index=true
    • https://s3.amazonaws.com/norozovijalu/alcoholics_anonymous_4th_step_worksheets.pdf
    • https://s3.amazonaws.com/bofake/29886522793.pdf
    • https://s3.amazonaws.com/zusevamasor/bullworker_x5.pdf
    • https://s3.amazonaws.com/lepefi/37634232361.pdf
    • https://s3.amazonaws.com/xumakomowi/20535291968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f617.bin
8ef37daf0d67856101818e25cd4debba9e8274b3a4bea6bf6ab7604d0bdb3701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5124 bytes
font_01_sfnt_off00010795.bin
b3fedb0ef4334b4ca5d45fdb0b945290361794fc6943ebf76681dc5edd094d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10560 bytes

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