Malicious PDF — malware analysis report

Static analysis result for SHA-256 c586b54c6ce84d5c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 19:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4a78d100f508f54bc65c67c5d263d441 SHA-1: 91ee1820d8f26fdd742872eac42736f4f14cdadf SHA-256: c586b54c6ce84d5c0fea26678c0095d1d565fb4d715ac0e16bb6ba4d54cfebee
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of multiple PDF_SEO_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://pelibifir.ru/wix?keyword=big+nate+goes+for+broke+pdf PDF link annotation
    • https://cdn.sqhk.co/wubukuxivupe/gehbLig/install_home_assistant_raspberry_pi_4_ssd.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/8c63be9eb6.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jgh9hbe/free_rider_track_codes_dirt_jumps.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/7Bijgy4/paul_hardcastle_jazzmasters_1.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/jelinoletifumi.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/kerisatasufuz_nuxowulip_depepejefo.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/voxoxapaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_602d5404e3b39.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/7368872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_60049b913757e.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/jgjgIrX/41643018253.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/15ebb1abeef68.pdfIn PDF document text
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/retapabuwoga-burulomomip.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/vjdQPif/ball_bash_brick_breaker_game.pdfIn PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/4476059.pdfIn PDF document text
    • https://nomalepizu.weebly.com/uploads/1/3/1/3/131398516/luzasefavixon_tajuwubojeguto_lujanugizefe_pubivipumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_a3b0b13d96d6441ebcbcd9e8adc48010.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_e461301f3a5e4e2d84932f3a80b8dc1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/sikkens_cetol_filter_7_plus_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/vuberofitewubur.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5428 bytes
SHA-256: 20d11566d1228cd5f74f113fc3338bd1843f1ab62de3e05dac21c9fc00d0b0f0
font_01_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10692 bytes
SHA-256: 08fe68b7aa28e5af60ddc45e148d5b1c54ff0f4e403cd0e6dafc9e27f854efae