Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9f318ba5cc7672…

MALICIOUS

PDF

114.2 KB Created: 2021-06-04 11:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 69121fc50f9c45157df74c5481fba18e SHA-1: 182f9cebd97673f99a6f742b10aed5dc59cd7fee SHA-256: df9f318ba5cc7672d92fd10c5e6490a6fcbf8e5b2a60a29879142f072f5c29a9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is identified as a link farm. The primary URL, 'https://golowaki.ru/123?utm_term=fifa+world+cup+2018+bracket+spreadsheet', suggests a lure related to the FIFA World Cup. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=fifa+world+cup+2018+bracket+spreadsheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486758/normal_5fd8e161f17f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ffa630743818.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/jazewuvupurimolakaw.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/4783b140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_6007fb2c3f50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_605f767738c1d.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/radage.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/d12c6aad-7671-4177-951a-30f7ada01622/cpc_study_guide_2018.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/11678548454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962e94bc-bad1-404a-9dca-4856d418b90c/why_not_afraid_of_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4b7600-e56a-4e77-884a-54332fbc155d/67557280522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7897754-79bd-49e4-bbd7-3d555d83a73c/felusobixixazewowu.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144427800/xakazep.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428631/marketing_segun_stanton_etzel_y_walker.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144489876/75327472630.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505272/what_are_some_limiting_factors_of_photosynthesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dd2ca6-0031-43d5-bc60-26f1628bbff0/4436019805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67a20a6-aa5d-492b-9a3d-923ade342990/why_is_active_listening_important_in_counseling.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/mini_weapons_of_mass_destruction_free.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/xutolusijukagugigo.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427872/53580350425.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A2 6016 bytes
SHA-256: 621f2dd770389da06aa1af610c866c243bcff2ae9f4c26231c69e29194e46544
font_01_sfnt_off00016c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C30 24440 bytes
SHA-256: 3605efbe522e253b54e857227845a2fc5ae7d0d5f39671cebcd89ed6c7480a53
font_02_sfnt_off0001a395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A395 16340 bytes
SHA-256: ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8