Malicious PDF — malware analysis report

Static analysis result for SHA-256 846cb5db84e04060…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 15:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24a79c99528bc336bf5e8a943d2561c SHA-1: 6ea795075649993d9e6853d0498ea37cb6c806d6 SHA-256: 846cb5db84e040602527a5ceddee0304f697e8713454bcf46ea36d5359587241
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though truncated, mentions '5 times table worksheet year 2', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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/strik?utm_term=5+times+table+worksheet+year+2
    • http://vojemodipu.sportsontheweb.net/reorder_sejda.pdf
    • https://miwijefovutifim.weebly.com/uploads/1/3/5/3/135316182/8d58d97624.pdf
    • http://tesupelaj.sportsontheweb.net/vegan_monster_protein_review.pdf
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/a08660.pdf
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe875cab2363.pdf
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/domulelevile.pdf
    • http://5-euro.info/mitisubulutokunexopowoluzksga.pdf
    • https://cdn-cms.f-static.net/uploads/4416153/normal_60164bfd681da.pdf
    • https://static.s123-cdn-static.com/uploads/4408195/normal_6008013de150b.pdf
    • http://tometifo.getenjoyment.net/c_program_to_find_area_of_circle.pdf
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/juxadukekizu-sosiz.pdf
    • http://palopej.sportsontheweb.net/97694728929.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/zoxixifupag.pdf
    • http://mebelintera.ru/22259268340l4zmk.pdf
    • https://cdn-cms.f-static.net/uploads/4467975/normal_60412c0c70bdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5959e6d6-5802-4508-bdae-215ac232932c/dexan.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_4007fa640590405ea59676d03abee2fc.pdf?index=true
    • http://tebaputazaxuva.myartsonline.com/pobonuliribivorimixeko.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_1371343c49df4ee7a1b75fffba7475de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f24c06de-7677-44ac-80f6-73441e35d567/hmdx_rave_speaker_disassembly.pdf
    • https://uploads.strikinglycdn.com/files/a6564718-d0dd-4810-b827-937a8f7785ef/11063223370.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c4.bin
e114a4704de6fa4aa22e9b220d9c01a9ca9619d4c9f22e07496577c08ba35638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5484 bytes
font_01_sfnt_off0000fb59.bin
248e19010ca36ac74c9f77a2dc025ac8180eaa716a105a66b051ffb74e003b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10656 bytes

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