Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c37b06db8abae7…

MALICIOUS

PDF

70.5 KB Created: 2020-11-13 13:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dd668b364c3f2fc81d76d780787ffba8 SHA-1: 960175e9c20b5bca3767be553ea2681929bf1c52 SHA-256: 32c37b06db8abae76b0df53e4f0bfa10267542ef50bf3c4d82f3132d26613a79
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute SEO-optimized PDFs. One of the primary external links, 'https://traffset.ru/strik?utm_term=bioethics+principles+issues+and+cases+4th+edition+pdf+free+download', suggests a lure for free book downloads. ClamAV detection and ML classification confirm the malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=bioethics+principles+issues+and+cases+4th+edition+pdf+free+download PDF link annotation
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/fewed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f8a786380ae6.pdfIn PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/986143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5f8a2681af0e1.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/b16485edfd0.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/67938830-482b-4d4d-a37e-4e865c2b76f9/advocare_24_day_challenge_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9d1938-3e89-49f5-8599-05dfaa730120/mazul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633c49d3-bd09-4a0e-88cf-14007525cacb/tree_of_tranquility_gift_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b750d0d2-e43f-4de9-955f-cf80eee83c67/wilmer_sotomayor_biografia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f025f9-7174-4223-8c6d-95bd73f5433b/riwelegusirirokajodevunul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f31aff-76b1-4033-8ec7-6832fb39085b/84850356687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78c0758-0807-4183-9fee-4cbdbab16631/19579036189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f390f662-4d4e-4fc9-8f5f-9246748f64ef/navy_federal_notary_fees.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 5472 bytes
SHA-256: aa79c49ca60c39508e971ac6080f095b0271400322ce3a5ee6b1d93e9d441cac
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10668 bytes
SHA-256: 01fdf536daf22990a16fe600649b7550309cac0d2eeaa8ca3a7c9ba725e96136

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