Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd95c14c5eefdf6…

MALICIOUS

PDF

70.2 KB Created: 2021-03-15 01:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f48046442d3101d6458798eab7bbf19 SHA-1: d98d80a10f7999f034b879a18add52a505d73fb6 SHA-256: dcd95c14c5eefdf6da962fb3e33f9a1992ffa63477f112396f975002bab6b93d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded links, with heuristics indicating it's a link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://yafferge.ru/award?keyword=diabetes+alloxan+pdf, and a prominent link farm URL is https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/e4c13d676b7cac3.pdf. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=diabetes+alloxan+pdf In PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/e4c13d676b7cac3.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/902960.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/df255d4256354.pdfIn PDF document text
    • http://turodes.iblogger.org/hip_hop_new_album_song.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/2681fa776a79df1.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/galupolarefitinus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopeteb/29407950141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054995ef-674c-43a5-9f53-61e550310b5a/vesibemuzubixexetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f33349-60a9-448e-81a2-b577b325bea8/cuantas_calorias_tiene_una_cucharada_de_miel_de_caa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jodizoxurabemeradomaje.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/pastest_paces_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f43276-ccad-4877-96ff-8164bb2e8763/55164152160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf1606f-0db9-4ee2-9f65-e5aa114bb880/machine_learning_tom_m_mitchell_solution_manual.pdfIn PDF document text
    • http://tokafibalo.epizy.com/favojuwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42336ce7-bcd9-41e9-8c27-b3cdd23d0045/86260576508.pdfIn PDF document text
    • http://gimapetabotoza.rf.gd/how_to_prevent_identity_theft_on_social_media.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188fef01-980f-45b6-aa74-8da687d891c2/the_aeneid_translation_book_xi.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/design_studio_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d17e1ba-9259-4966-85c6-d800b6e18c55/5934444248.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/danamarurinojifelibogumum.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/guzukipovarodi.pdfIn PDF document text
    • http://bozivexaterem.epizy.com/3319323259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501354fc-fb2f-4734-8532-8a2cc47c634d/30686897076.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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 5148 bytes
SHA-256: 249f19052771e4fad6dae928e7e4704ccb0f015f791fddb66740a13d6e82ac09
font_01_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 11316 bytes
SHA-256: 1762b1c5535ac36e30862361ffad3c6e8cc0b640821dfdeb2bd9da88fb82fbc9

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