Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f809b09fc9de2dc…

MALICIOUS

PDF

102.3 KB Created: 2021-03-08 05:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 07cbcdc447fccc0a94e9fcb17ded1da8 SHA-1: 99eef0fc005308a89ab823775a6efa7be418651b SHA-256: 8f809b09fc9de2dccb21579e04745ea33a24c155dcded475b9ebabf940b921af
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gimoguvi.ru/123?utm_term=do+i+need+to+enable+spanning+tree+protocol PDF link annotation
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/kupupelifadodetiwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60346bcf02571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_602b4f814d1f7.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/muwelesapum.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/tinapuxikasipexexaf.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/hamilton_beach_soft_serve_ice_cream_maker_recipes.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/masaxakewa.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/jakokagerujomozij.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/deck_of_fate.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/kelaxojasilix.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/will_star_citizen_be_on_xbox_one.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/3368783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_60437ef29d34f.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/89b191af-1fd9-474b-8637-ac710c72adbe/17518654557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b09da6-8085-4355-aa7a-a083aa67e9d8/toboxib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac3279e-866d-4825-b751-f1e04434f077/rorepakotekiraga.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/godixex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd64fbc-6ab2-48b2-8991-aca8cd224027/55155970301.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/convertible_note_term_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720b938e-ac24-48f1-9601-00986aa5c245/nogadiwebowave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6403a84-cbe7-495a-83ea-53e0e5cda0b8/71595271460.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/phosphor_bronze_sheet_thickness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d561bd0c-cdea-401d-9fd1-12ff240f45fa/how_to_install_correction_tape_on_a_brother_sx-4000_typewriter.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/reruzu.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_off00015278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15278 5380 bytes
SHA-256: 17dfe8e7ff5db07f65249cda63e551aa01c467189154273b729bdc07bbc664ed
font_01_sfnt_off000164cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CC 11072 bytes
SHA-256: 07b3cff4dd57983ac7734ddcb36b1f2cf1eab4dc88fbddf0fad73c515bd6acee