Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e168fb848c1f32…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 16:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3dd527a451f30e9837d066d07b49c4d3 SHA-1: 161ca3df471e6b55d93492588fb38d3e1d8d6635 SHA-256: d6e168fb848c1f3215429a1d7c4b598bdbcedcbaffd9b5c809d60874a1021867
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 0.9996

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://synerhu.ru/pbw?utm_term=how+to+thread+a+brother+vx+1120+sewing+machine PDF link annotation
    • https://jumejavirufefe.weebly.com/uploads/1/3/4/7/134765112/jozuvuzitidade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_60606a1c4479b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416326/normal_5ff7f218a3b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fdf0192a01ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc90e1d29311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60620eb98f485.pdfIn PDF document text
    • https://didemutigejibal.weebly.com/uploads/1/3/4/4/134400923/wewobopozanafel.pdfIn PDF document text
    • https://woveguzusozor.weebly.com/uploads/1/3/1/3/131383383/vutilu_bavesagilux_wijuvi_xepagurerudi.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/a027b0405f6a9e.pdfIn PDF document text
    • https://saposoralax.weebly.com/uploads/1/3/6/0/136025319/doken.pdfIn PDF document text
    • https://sizamefoz.weebly.com/uploads/1/3/2/7/132740636/dadolezexane-keminufoditen-wesukazizuzoni-vewijasunegeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_600bc95dba36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fda13a1944d8.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/fupifuz-tezimexur-papuladovuse-rigaxizo.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/fdf3ddb6-bf81-4f2c-9268-fd7ecb9192df/897093311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b112a0-256b-4e7b-92be-6e914bbb0882/is_it_worth_flipping_houses_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab60067-ed00-4bc5-b69b-67021af8fbc5/tidorarekitovawen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8470a7a1-6808-4b49-82ff-27742beec36a/arkansas_dyslexia_resource_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74c36d0-3461-466c-b4fb-7ae60e83f0d4/richard_iii_act_3_scene_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384ad2c1-22fb-4f6f-8b36-ea63dea25b47/73719705055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1127bd0c-5dc9-40eb-adfc-a3944f9f1114/how_to_see_the_formula_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe33380c-59f7-462f-94f2-d381206e73cc/picsart_mod_apk_free_download_latest_version.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_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 5968 bytes
SHA-256: 2b2ccc12a7e4d5ef4184e6f95472a4601a844d71fc765c63e7ec12ba7a8aaf33
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10836 bytes
SHA-256: 4c552c0fe1cadfbbf5206458fc354ae1bc5933698851b51e73e097242941da74