Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8d9b5216de5d60…

MALICIOUS

PDF

82.1 KB Created: 2021-03-29 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abc3c84f0bc8167e2033f9161cc17d4f SHA-1: d6a09b994c33eccdd54c869671c5df1d0d797397 SHA-256: 7b8d9b5216de5d60cb6a0688c78b920562a222f7eff2033aa2dc61e38785c3e4
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one primary URL being a potential phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=chuyen+pdf+hinh+anh+sang+word
    • https://cdn.sqhk.co/pofifarim/1ZGmbjb/management_des_entreprises_bts_muc_cours.pdf
    • https://cdn.sqhk.co/puzadowoke/jIGDHgf/flat_pack_furniture_manufacturers_uk.pdf
    • https://cdn.sqhk.co/daxerarugak/gphdT8g/ding_dong_bell_song_words.pdf
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/bexunijuwas.pdf
    • https://cdn.sqhk.co/nodezaneripe/eEHvs8D/three_kingdoms_overlord_cheats.pdf
    • https://cdn.sqhk.co/rudolikube/cjaQRhd/57551633577.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/joxegofiluvak_fapobukusowu_wifuteris_pakugevimapuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nafamaragisek/4242042006.pdf
    • https://s3.amazonaws.com/lezerawe/general_characteristics_of_non_chordates.pdf
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_7d68a8e56209491785bcb0c57663a9cf.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_21a78947e2c9453c8853b17a2eea30dc.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_2c59cf13337144cdbd96b1dd4c5cc531.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_0d4456009ea04a8bbab357ee97d82409.pdf?index=true
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_bc3ef83451bb4cdaaa127aa79ccc2e85.pdf?index=true
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_d7cd005b9d6748cc95e5d83f9f91d66f.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_3c20c3f1e2834c7c9162b717fbeb61f9.pdf?index=true
    • https://s3.amazonaws.com/tonemakopinibem/2017_august_sat_answers.pdf
    • https://s3.amazonaws.com/pavujiniz/rufuvinerugu.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_off0001020a.bin
42f1a60e2f842fb269130ebcf1d1bc97be7e4aba67357cb1330b020495cdf22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 5368 bytes
font_01_sfnt_off00011463.bin
bc9c9ba1cf8ecf0dc5ca9211e3b131d26ff1b4c8dc08957fb0c8af794d18e218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 11800 bytes

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