Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0873f674328ef28…

MALICIOUS

PDF

77.1 KB Created: 2021-06-07 11:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: be2665ddbe408a1b7e5222e9494909a6 SHA-1: 509342e65a928b9f22b9651b75b00ed990bacfc9 SHA-256: a0873f674328ef28c2552e29ea9335142c4a31f9687821e96cd989c67fa32efe
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm or phishing campaign. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and external link farm behavior suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://synerhu.ru/pbw?utm_term=ps3+remote+app+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fc57f142ca69.pdfIn PDF document text
    • https://zisawotagaxikad.weebly.com/uploads/1/3/4/4/134478332/6efdf4e8e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5fcbd85444df4.pdfIn PDF document text
    • https://tofeligekejogen.weebly.com/uploads/1/3/4/8/134873344/c2f72e78.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/gavuboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_60339e208a08f.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/16881.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/7724193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6033324a67f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366044/normal_5ff1bf641ee9e.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/052d9aca-602b-4ebd-9aef-04b0fb689d7e/kavirigoratemipo.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/unconventional_machining_process_mcq_download.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/f/free_printable_vocabulary_worksheets_7th_grade.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/koruwumufofowopin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b54eeb4-e8d8-4701-bd5e-215662c142e4/how_do_you_know_if_hes_genuinely_interested.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/what_does_it_mean_when_you_always_see_234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0256f8-e8c3-43ff-b18f-6048e526e786/how_to_make_pizza_ranch_sauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d380483d-0f5a-4a14-8aee-65feda033192/tc_electronic_flashback_2_instructions.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/lirolumi.pdfIn PDF document text
    • http://kufugaref.pbworks.com/f/download_corel_draw_x4_untuk_windows_10_64_bit.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144533037/smart_home_security_systems_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5611cbb-e448-4d6f-a833-da31bf30772e/business_law_and_ethics_mba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e6b9c8-e735-40c9-8207-8e113bdc6c0d/vilul.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/f/yakima_roof_rack_near_me.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/2982181626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6820d8ea-04b8-4050-8e1a-b55e31ad36d0/ecuaciones_diferenciales_lineales_de_segundo_orden_ejercicios_resueltos.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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5236 bytes
SHA-256: 7d0a2eb77bc6e6c92c023721f0e953d0d3e1290bb1566405e9c9863e25c579db
font_02_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 11272 bytes
SHA-256: d58bb191f5f66fee2ed4b809e53d96c7a1c93945159302cbe51d7eb956e956fe