Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd35ed8e2353cf60…

MALICIOUS

PDF

75.5 KB Created: 2020-11-17 07:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 218261fada84ed28ae3b9e190c466a42 SHA-1: 8cdc60e55733f2ba030368a2fc20aff16491e1f9 SHA-256: fd35ed8e2353cf6038cb36426df2442fe27ecbcec27a476044f707c6dbaaaefe
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or link farm operation. 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 is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=fred+claus+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457857/normal_5fa6b65de4bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5fb31cce83c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fb308c80388e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fa4c2fbb1669.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/wosuzuwawo.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/bcd227.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/3e7fdc2fc638.pdfIn PDF document text
    • https://doriruvoni.weebly.com/uploads/1/3/4/5/134585963/varokiwaxo-nadifuxovowap-bevazuwi-sivozikag.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/gogowitijunamila.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/6c71d084efb03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f8f5ef2d4a6c.pdfIn PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/1122560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/minegikukovel/ai_126_flight_status_del_to_hyd.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/shop_play_win_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 4968 bytes
SHA-256: fed5d737ac35c01805adb9d5bcb50c57481c88f8387e13b1b9f32f31fefbe789
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10320 bytes
SHA-256: 4faa50c96fdb71aa94de02b9a0f17e88b5ccdf823defd4a48a0c621791c6b77c
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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