Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fd755f48ea9524…

MALICIOUS

PDF

91.6 KB Created: 2021-03-18 04:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7c559318feb74737e290ebfc53a7e077 SHA-1: d42a26f1d7088b0432174f4bcb5215e690bdd0b9 SHA-256: b2fd755f48ea95241dd0d3eb2b7adbd775ba035778e1c4a825bf61d379eb5d6a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, identified as a link farm, likely intended to redirect users to malicious websites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous disposable domains and external links suggests an attempt to obscure the ultimate destination and potentially distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/award?keyword=black+legion+40k+pdf PDF link annotation
    • http://xojuxelase.medianewsonline.com/how_much_does_a_sony_bravia_55_inch_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/HZKTgj4/remove_watermark_adobe_acrobat_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/hFFQthi/42215329724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_5fe2a4356afb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_605059efa83f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fdefed1be7f0.pdfIn PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/d84a1.pdfIn PDF document text
    • https://vusobodez.weebly.com/uploads/1/3/4/3/134320146/0f37996b.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/2235339.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_to_tie_a_slip_knot_for_jewelry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_6008c1eaf19bc.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/cV2jijc/great_battles_medieval_save_game.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/5593f9a1.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/OjYidhj/51464302549.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
    • http://wilaroxu.atwebpages.com/lipujefasazukarodoriwut.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_ca2d70ee0d7e4dcc81ab5ef6b633cc3f.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_e3c0fd969c35409cab75cbd729af5ee9.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_16ee29f7b5dd488dacc4c8c813f1bb2a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 5100 bytes
SHA-256: 9cd9d02abe40a8843657dbbfb51b589ed4e44341c6f009d59d56be9c60175978
font_01_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 11000 bytes
SHA-256: e7b634916e481a67b26db40ae8990e8ae1ce4f3e073e962291e20f1da26b4d50
font_02_sfnt_off00015387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15387 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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