Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5ef29dacfe2c95…

MALICIOUS

PDF

137.0 KB Created: 2021-03-21 22:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ac3a23d8f9103c01851ee25f00a3105 SHA-1: 23c7d9a76822783e5fb2739d453b46263c499259 SHA-256: 7b5ef29dacfe2c958b8ff95361a90527ed1eea985646d19c3b7a56eb9f29c5bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://jacksth.ru/award?keyword=bayesian+approach+pdf PDF link annotation
    • http://xorelurisadadun.iblogger.org/4116429357.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/9790070.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hTgcuie/33818646101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5feb5d477b41f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5ffbe04bd1c0b.pdfIn PDF document text
    • http://tebaxedo.22web.org/rozivavajevezetomiv.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/7thboBX/25726188732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_6031f4d92dc8b.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/nirabojilabesenuk.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/bewibiwat/barfi_full_movie_free_in_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24278e9-08ed-4afc-b5c0-b8b172f4d202/nail_salons_near_me_open_now_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cac4041-76f7-4b20-916b-3f83cdd74991/botuvatavedutolabozipafix.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/50841231446.pdfIn PDF document text
    • http://vedaremix.epizy.com/does_apple_watch_sync_with_android_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/faisons_connaissance_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B193 5072 bytes
SHA-256: b2f1ebab254022e556e6bfc5eab486b465a8b733fe74d7099eceb42edd157ebc
font_01_sfnt_off0001c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2C0 13832 bytes
SHA-256: 10766686875e72ef6e34f9c16e2a629429696742d621bf22ff97d6aeed54d57c
font_02_sfnt_off0001f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0FB 16636 bytes
SHA-256: f19c4703de702db0c158378668fd61e7aac70ce290cd808a9c67652b2dc0b231
font_03_sfnt_off00020821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20821 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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