Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cef22ba6c8b3f92…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 21:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fa3393a89ec6c3e63c88696c063a6cb4 SHA-1: ef84c8c136e7bedcee9830b54feb9be330a77f9c SHA-256: 4cef22ba6c8b3f92b99dc56b64f0236cf9fc9ec952a87922d84a4f5cac73a3fe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/wix?keyword=toro+recycler+22+manual+20333 PDF link annotation
    • https://cdn.sqhk.co/gutifusuf/hdicqCJ/download_zombie_age_3_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5fe04f708509e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_601dac4fc5a19.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/jb8ibgg/megaxis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_605c3f6e082de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_6018e7f90d472.pdfIn PDF document text
    • https://cdn.sqhk.co/fidasawon/hd90Sjg/turbotax_card_balance_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff47236d1e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/gfuSsjb/48504371899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf02c2b2-c6f3-47f8-b558-1ed6c91b21d9/what_is_the_characteristics_of_a_good_project_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6db532e-6264-4ceb-81cb-16682bbb9d0e/bissell_spotclean_proheat_pet_spot_cleaner_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1b1d7b-5b99-44aa-b160-4e666d6dc1ab/dozedujoluvepag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0d484d-22a0-4e81-9a97-bc5c7c85bffa/18289419144.pdfIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_bf446d90dba4494caea721cd0b954c80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc6701e-24f1-463c-bde5-6168933e2735/tufebomerimi.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_19c1749ab3a04d2aa14c6658e617faf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/letter_h_worksheets_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/48396142954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71192f69-0635-4804-bcbf-a3ef87a87d43/demef.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_962c79d1f886423992fc45e9d6296da4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10cbcb02-4462-4a1b-869b-8bde688707d0/toyota_camry_hybrid_2018_for_sale_in_toronto.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/vilemozezelujugegameni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0536b3ab-74ea-4a0c-a455-bbaa6a7be589/shakespeare_word_search_22_plays_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1c76eb-f937-4d97-89a9-90b9a40a4bcf/how_to_fix_epson_printer_ink_pad.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_0228502bb3c74f209bb5d9c807be291d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 5256 bytes
SHA-256: 08a81ea189523e7f41ab90c4b4f91ffc71ac1981e085e1ffbd816de0f2fed6cf
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10872 bytes
SHA-256: 28b9af4a52f17ef789aa7f86813785fa741f7d1a35d73bdd0caa3f5849ba41fa