Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a5c707163d7731…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 03:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 35ded8fe70eca99239c2b79459100336 SHA-1: a98ff85d3b308c66618c0e4a38034c3cd35133b9 SHA-256: f6a5c707163d77311b52e1ecb2533ffefbcc928b5d40fb5da0d7c3e28449bbd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/123?utm_term=using+ok+in+formal+writing PDF link annotation
    • http://it50disconto.info/34998115021cgp5x.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/G1gdeJU/25273734960.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/woxinezaleji.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/mechanical_design_of_machine_elements_and_machines_a_failure_prevention.pdfIn PDF document text
    • https://bekarofadu.weebly.com/uploads/1/3/4/3/134346179/momemuxozeb_mupolabite.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/kerodibeved.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/3382582.pdfIn PDF document text
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/lakezipupejosiva.pdfIn PDF document text
    • http://cuzinfo.ru/equal_employment_opportunity_plan_template03f68.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/dapegobuledobipaluvepeku.pdfIn PDF document text
    • http://contact-git.top/original_jawbone_headsetmxemn.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/0TgCmhf/galaxy_conquest_board_game.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/240505.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/Wjv7jhj/jewulu.pdfIn PDF document text
    • https://gogujezirud.weebly.com/uploads/1/3/4/6/134655685/6609468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_22f474b9e71641399344bcf5171b1e73.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_3af0d7f7293b4d08a47a55b8009cd5a3.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_cee9dd1b88f94d4fb29ef002f4392fd2.pdf?index=trueIn PDF document text
    • http://bitujiduruv.myartsonline.com/45124020520.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/evening_dress_pattern.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_33bea53ab91046ceaf9d1a9276e8905b.pdf?index=trueIn PDF document text
    • http://jagomizaf.atwebpages.com/xexilizobirubawirekumedet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5232 bytes
SHA-256: a9f7ba781b39d347747494854040c816feec9ccefbb4ec965f1d17a69029fecd
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10980 bytes
SHA-256: 1571c4a74f72a3acdb34c0b8b47ccb9ac9f65e4bd3feff050c7b086e9ec4e22c
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15