Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c04a5ac443bddc5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 19:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab4aa72365515e90c7234d1b287d86fb SHA-1: ce51565a12bb082fa0ae7d5ba2e594eb0f1a2445 SHA-256: 0c04a5ac443bddc5405f7e319e5f65fb654fef9ffb38fc155324b60ed5de428f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=dansko+men%2527s+shoe+size+chart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5ff2dd059d049.pdfIn PDF document text
    • http://thecet.xyz/alfred_adler_individual_psychology_theoryza8o2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fc602285e069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_601a62a9661f0.pdfIn PDF document text
    • http://vitrinachel.ru/london_bridge_full_hd_wallpaper0zqwg.pdfIn PDF document text
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/sadazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410441/normal_5fe23f6cd0321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_5fc8143913cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/zTie8if/download_granny_chapter_2_mod_menu_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/o5gpLBF/65987581266.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/foxitup_muzutakewunotul_vomunuvuxumusi.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/gfgdItS/blaze_monster_truck_coloring_page.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://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_e3af335d3b994469a7ddf45c31e25342.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9637127b-f203-4ea7-9649-c2b9f8bf1c02/8_who_joined_english_settlers_to_celebrate_the_first_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2131d57b-f627-44d9-89ca-edb6b5767d4e/fijosopobapigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d8a60c-3d0c-4e44-b17e-70406c449487/jujewukumotolikovazi.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_a3a4528fc07a488aa51a532988d0d511.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc535861-2540-406b-aad1-ad1026e5cdce/85922200614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d646a6-9cfb-455e-b58c-41a7937592b8/tikunevinepaxunotix.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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 4940 bytes
SHA-256: 1266f04cf7ffddc3e72fd5c16a5b3257b0282e3242c2173afe5aa045abb3943b
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10988 bytes
SHA-256: 51cc8013a3ff9951033d4f8e42783b123e6f07dbd7fb2492862b82abac334c6f
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378