Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a9864f20c9e7d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 00:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 924d5fb6d9c637db93e8bc628a42a773 SHA-1: 4379121aa21af88727ab5e4221111c17f1bd0273 SHA-256: a10a9864f20c9e7d573ba4803385773939565c01a27807669a8122e88fef8117
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://yafferge.ru/123?utm_term=how+to+cook+rib+on+the+grill`. The document also functions as a link farm, with many URLs pointing to various PDF files, likely for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=how+to+cook+rib+on+the+grill In PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fdefa96a08d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6027517d7c229.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/jegulavejituf.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/powug_rovilonojaji.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/pitonudidule.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/Ny8iesT/zumefo.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/ibJiahc/land_rover_discovery_5_off_road_accessories.pdfIn PDF document text
    • https://dunilugifesa.weebly.com/uploads/1/3/4/4/134471262/18aff8.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/367bfe8b13f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fcd0c501487e.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/7f579.pdfIn PDF document text
    • https://wolafufep.weebly.com/uploads/1/3/5/3/135305459/xozilinazuwuf_rororolewosin_folemituga_walegisuxiponen.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
    • https://s3.amazonaws.com/makixibawumebol/aluminium_perforated_sheet_manufacturers_in_hyderabad.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/72114645282.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/colonel_bogey_march_sheet_music_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 4720 bytes
SHA-256: c34df21bf60fd01fea0ec92abf393a6371645da693bed22e0f51acea55ef4f1a
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10636 bytes
SHA-256: e3c580a2a5d45d3bdd9a2985f5ffc3cfa514ffe5784c0fc0e548ed06d277c174
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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