Malicious PDF — malware analysis report

Static analysis result for SHA-256 f804ec339442abf0…

MALICIOUS

PDF

102.9 KB Created: 2021-03-17 21:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e149544fadd7af415db2054e7f0c4a20 SHA-1: 7f39939640486d9c2bdfc2bc406bc2924f2580ae SHA-256: f804ec339442abf0fd46f7f4d2dc05680d16e341e7c4236f8f1ec27346c1e10f
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=physical+science+if8767+answer+key
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/fibiborabesikavili.pdf
    • https://cdn.sqhk.co/wubunepan/phbzgin/world_ship_simulator_2019_pc.pdf
    • https://cdn.sqhk.co/naliwanik/agcvbur/symmetry_board_casual_memory_games_for_seniors.pdf
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe4073de385e.pdf
    • https://static.s123-cdn-static.com/uploads/4444852/normal_5fecbb8dea807.pdf
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5feea35657c60.pdf
    • https://static.s123-cdn-static.com/uploads/4493917/normal_600728e076629.pdf
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/2249258.pdf
    • https://cdn.sqhk.co/vusutesilo/cjaPjdn/wegepofesixivevufiku.pdf
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6042a62ce06fd.pdf
    • https://cdn-cms.f-static.net/uploads/4470220/normal_600a3cf4d4dd3.pdf
    • https://static.s123-cdn-static.com/uploads/4481164/normal_6003b94ded15e.pdf
    • https://cdn-cms.f-static.net/uploads/4412174/normal_60409d7d9d4c2.pdf
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/godatul.pdf
    • https://sovevalejuwup.weebly.com/uploads/1/3/1/8/131858043/gafanipi.pdf
    • https://cdn.sqhk.co/levowexesu/4coGgiW/allo_allo_tv_series_imdb.pdf
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/kibexefowugod-watekelajila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_54b3e20ca4bc46a9affb5a6403a89678.pdf?index=true
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_5809bf622bdf4f29ac91094b2680f07a.pdf?index=true
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_3757064e03c84504bb55a25eaf4432f5.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_029f60143f6441caabd24f19ca27bb06.pdf?index=true
    • https://s3.amazonaws.com/midaguvimabof/30980055122.pdf
    • https://s3.amazonaws.com/nefunupu/wulobixuvofezizivur.pdf
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_f9ea358c76ac4d5f8fc5514fcc6de0cb.pdf?index=true
    • 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_off00014cf8.bin
ffedf3f7baec1c154fc23ea3d93be019123fd71b91b82997b7ddc6fd377ec878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF8 5656 bytes
font_01_sfnt_off0001605e.bin
3f6e8c76bfe33a174122707558b5f54b69cfe86fb998fe0a68b111e02c198486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1605E 14756 bytes

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