Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e7284412c86777…

MALICIOUS

PDF

76.2 KB Created: 2021-04-04 01:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5db2b1e971333c1c91d83c15816a3ce SHA-1: 7c1d6412775486156143a1fa65b4843c88e3f5dd SHA-256: f2e7284412c86777024f7b60b011a6fc4d952554912e15498b93a5613f22e193
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary URL being 'https://bologen.ru/award?keyword=important+days+and+dates+gk+pdf'. The presence of a link farm suggests a phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://bologen.ru/award?keyword=important+days+and+dates+gk+pdf
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/noketaxuza_wemunigavume_jitase.pdf
    • https://cdn-cms.f-static.net/uploads/4421342/normal_603ed3ebed49e.pdf
    • https://xivilikowigonun.weebly.com/uploads/1/3/0/8/130813923/9763e4ec856ed.pdf
    • https://cdn-cms.f-static.net/uploads/4464297/normal_600d870048d93.pdf
    • https://cdn-cms.f-static.net/uploads/4481286/normal_601b1dcfb1ac9.pdf
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/3142281.pdf
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/wejera.pdf
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/1d66ed.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/lawazisaxutozelex.pdf
    • https://rilumawireg.weebly.com/uploads/1/3/5/9/135981263/maragozu_fowik.pdf
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/a89a11768d10.pdf
    • https://cdn-cms.f-static.net/uploads/4464068/normal_6064be3c72624.pdf
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/wosetoxijug_momupukapo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_2ddab301c95540d3887e645a14daf80c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b200ebf7-2372-4df0-ae99-2e5b78dbbb49/83636526152.pdf
    • https://uploads.strikinglycdn.com/files/1bbe9267-e058-4bd4-a615-a3e2467f8358/primal_blueprint_fitness_assessment.pdf
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_e96e764d9d5944b58bcd7ddaeeac2c91.pdf?index=true
    • http://paguxesij.myartsonline.com/skf_bearing_dimensions_chart.pdf
    • http://sipanokule.onlinewebshop.net/26867603056.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_off0000ec64.bin
8d2e38c452ce6162d00c3f418d1e2607423c969fb000ebf6d7490f35f6df48d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5432 bytes
font_01_sfnt_off0000fed8.bin
03214c6c087a1b55b1494461c11aad8afe0bc841132d3696671635b459d3cc6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10912 bytes

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