Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8e1b013c224c35…

MALICIOUS

PDF

81.4 KB Created: 2021-02-25 17:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 402f4e789d8b8d603bcd36a0066ffaac SHA-1: 2ef6f2318a2cc57a3bee9eea69c79cac6d78bc93 SHA-256: 7c8e1b013c224c353946887e62e2d7dd469f31f173040f58571da512760c8128
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://leonvi.ru/123?utm_term=applied+statistics+and+probability+for+engineers+6th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5ff8b2d8d465e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_602f19a5452d4.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/us_fda_guidelines_for_equipment_qualification.pdfIn PDF document text
    • http://xtrading.buzz/50008878477yqibv.pdfIn PDF document text
    • http://ch-redirect.icu/tawuzemepevikezeknrs7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_602f406516efb.pdfIn PDF document text
    • http://kushtanash.ru/vaboruji7vl9k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5ff67550152dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fec3c1232435.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/iDwWhdD/my_movies_pro_2_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_602aa6846d7e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_602f60f5175f6.pdfIn PDF document text
    • http://zubiki.top/66841930089h5yje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_60328667cb7d1.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
    • http://bibekuxamawijoz.epizy.com/spanish_gerund_worksheet.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/1304510091.pdfIn PDF document text
    • http://mamesejo.epizy.com/connected._mcgraw-_hill_answer_key_geometry.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 4276 bytes
SHA-256: f19d8af70c402dca826f1540361420f18fccf02e175d4ce61a5e118962912394
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 5588 bytes
SHA-256: d348943c5514d154e9c865499bbff8be81074accff9617a0622a5f0ab21b5f12
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10292 bytes
SHA-256: 7844ed02e9eec193b091312032f205970dc1badac87590e5f153674da0611e1e
font_03_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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