Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748b5119d7a9845…

MALICIOUS

PDF

72.7 KB Created: 2020-12-31 01:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 51e2a376f0cfb0cc7795251bb196c5d4 SHA-1: d4f366cf391f209f5db19843ab97f34dddf8e250 SHA-256: d748b5119d7a9845a8b94a2aadc1886e87eb3fbd174b151e0d0213febceb96f5
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are disguised as SEO-friendly content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains references to search terms and PDF file names, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=mississippi+john+hurt+tabs+pdf PDF link annotation
    • https://cdn.sqhk.co/bezupidokaz/gddSgem/harvest_moon_one_world_multiplayer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5fa837cb584f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_5fea0341b8b25.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/djhhjgc/aliexpress_coupon_code_september_2020.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/247f072076ac66f.pdfIn PDF document text
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/b480a6dc6cd7bd3.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/630dd7a1-c812-468e-afe4-df464f084858/gupideborasuzebopuwab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fed6d80-9e06-43ad-aa07-43d66431c197/woods_timer_50007_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/gonuzosotawuririlani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec0fa66-35ea-4b75-9613-ccccf390fabf/67839291112.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/capacity_planning_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda4b159-5185-47c6-88c2-beaef846e558/experiencing_architecture_steen_eile.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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 5316 bytes
SHA-256: 67eeae214f16977dd33d6d45d3d014feb535e30e3797e16a6e139df02c491dc9
font_01_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 11488 bytes
SHA-256: 8dfea27733737ad9bc3c3790cb620759114ab69065c16b5cfb9e873b63cd7e9d

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