Malicious PDF — malware analysis report

Static analysis result for SHA-256 602a0f7f80bf447a…

MALICIOUS

PDF

94.7 KB Created: 2021-03-01 12:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ba8216717380a334e69bc55e168e2346 SHA-1: 5312104dee008e463648194d7cc502abb0709086 SHA-256: 602a0f7f80bf447a35ecadc5d564230fafadd2197e001780902ea39cc2952896
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wb?keyword=how%20to%20fix%20a%20washing%20machine%20that%20will%20not%20spin PDF link annotation
    • https://cdn.sqhk.co/kimefutif/jbichfR/bavexoluwuwabeniwilegaku.pdfIn PDF document text
    • http://kamini33.ru/arduino_12c_tutorial0rq1t.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/hdLz3RC/selozupunoluja.pdfIn PDF document text
    • http://domsale.xyz/scientific_method_worksheet_identifying_variables_and_controlst21qd.pdfIn PDF document text
    • http://andyhong.blog/cisco_4200_router_setupa7jc2.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/icgighO/tetris_effect_gold_mine_trophy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_6005410797438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5ff88523d5048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_6006be52663fc.pdfIn PDF document text
    • http://carbackseat.site/14886730174i0gze.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/ibPhije/black_beauty_1994_full_movie.pdfIn PDF document text
    • http://fortuneocredit.com/void_pyramid_wikinpz2w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/veraxawewib/bapiwis.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/xatojibowawiromusawexo.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/46994030255.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 5240 bytes
SHA-256: d775c1916a6cc2d7eea3ecc3f9cacc551813058b8b1c62dc98ac6cc93152747e
font_01_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 11088 bytes
SHA-256: 02b1be8ff246e5237fc30fbff011afe49a4a62a698bd1e7f9a7d64b4ce1e239e
font_02_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04
font_03_sfnt_off00015ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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