Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb885f71569876c3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-28 09:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0e5dc927357d15e8547bfedd9f8afc48 SHA-1: bb229a5009b31f28db985cff2adcec1e1d575af7 SHA-256: eb885f71569876c3f729a463f3a0fe61fda331160225ff07774f316aad68cc86
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. The primary URL, zajinet.ru, is presented with a search query for a product manual, indicating a lure to a potentially malicious or deceptive website. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious.

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://zajinet.ru/strik?utm_term=where+to+buy+panasonic+genius+microwave+manual PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/Qhgigd9/table_top_racing_world_tour_nitro_edition_review.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/nugezupuvojamijetes.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/shark_navigator_vacuum_parts_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_600bcbc9603f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/hg6gchc/electronic_component_symbols.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/eNBjieZ/ultimate_bottle_flip_bottle.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/8718942.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/MhgjdaO/piboriguzebetexobef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_602ed2bbb022f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_60515b12d3334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5feba2e0dc481.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/blood_collection_tubes_and_tests_chart.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/4c84584a-cf46-46c9-944c-302b8a33a760/pilawifaxofulagegak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ed2da6-f3b9-4323-802d-6c714fae7f0f/sanudixasotadadefan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898b455b-6d56-430f-967d-49094cd7742f/how_to_operate_an_electric_pallet_jack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069bb2e7-ded6-46de-880e-730e70986dfb/64533325525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8df7f7a-0e23-495b-a9d0-27378bad0550/wakebuvisigofaduwolowazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b74f10-bb85-4f3d-8e2e-3d784b75ce3a/jabubebavodovuvokigagogef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3538224b-e690-4d58-8ae4-c29f0d36dc58/98003037100.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5752 bytes
SHA-256: aaa4d99601475f86d36d6dbf4c289d0ba6de7f82c44caedd332720b0b151b12a
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10096 bytes
SHA-256: 629372181d1022896d6f9fe0538d5100f609e1c6c3ad18c0c10d37e959aca756