Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78cf92484523dab…

MALICIOUS

PDF

74.0 KB Created: 2021-04-05 11:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 39ac5f46e91a61c68e344488f1f2acde SHA-1: 5a6a126935945b75dad88dc090591b487c950f90 SHA-256: a78cf92484523dab8cf1302c21b2b3523dedea5806ed45ecc0dbf776f1fe9299
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm with numerous external PDF links, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=application+form+for+canada+pension+plan+benefits PDF link annotation
    • https://gumijunu.weebly.com/uploads/1/3/5/3/135399233/bd73bc2958.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/833dcabf.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/czytanki_po_angielsku_dla_pocztkujcych.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/17548518446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5ff708dc1fb15.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/2442015.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/comment_regrouper_plusieurs_documents_en_un_seul.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/bc03296c91a94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd7eef96b101.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/raguvetaxibuwibamol.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/jimotadosovab-xefunevanuxuder-seputerasowome-fidave.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/8f3d54.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/zezeki.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/zenorifuzod-dozasanuru.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/480553.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/65547811219.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/inkscape_svg_editor_download.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/purine_alkaloids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_f75212ccc5574b2d9e2344ba51115a1a.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/galujijukexiziziru.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_1e0f61d3cc3d4e5182f5580c58853639.pdf?index=trueIn 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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 5432 bytes
SHA-256: 57d68571a52ec1471c38b8faf573a10050342ccc7720f402c12be17d7cf8ae5f
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 11492 bytes
SHA-256: f2ae83c8dc4ba2c7e08d86022f34b0d42fd325c6ab8be84c9208222b2bbb0915