Malicious PDF — malware analysis report

Static analysis result for SHA-256 53860ca79c73d1f3…

MALICIOUS

PDF

77.4 KB Created: 2021-02-15 07:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b02f6f59857d7c5e99aed2e174a4436a SHA-1: e79bfe49483f5f45517d03e1a57851fe39c90a02 SHA-256: 53860ca79c73d1f3a6644f4a2bd106ea1a5b30f4a75f87926da1cb7d1d7d5ad3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=everytime+we+touch+violin+sheet+music In PDF document text
    • http://it50save.info/emotional_intelligence_bookskgiqe.pdfIn PDF document text
    • http://aarbuz.space/movie_trivia_quiz_sporcle97yok.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/17036455765uc0xm.pdfIn PDF document text
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/xudizobiruwamo-devediped-zilebopajow-mulasu.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/lopikesa.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/d1446c3733ed.pdfIn PDF document text
    • http://tujozavido.66ghz.com/blender_2._81_alpha.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/facebook_messages_appcrcuy.pdfIn PDF document text
    • http://rameautbxy.space/3172904677a3kjp.pdfIn PDF document text
    • http://astropsychology.website/tumblr_video_android_appr48s9.pdfIn PDF document text
    • https://mozimokitazipa.weebly.com/uploads/1/3/1/4/131407977/7841122.pdfIn PDF document text
    • http://fly-drive.online/61874392323m9aia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450641/normal_5fe276df7017b.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/masematin-baxuduponek.pdfIn PDF document text
    • http://vuxokiwi.22web.org/40841685754.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/play_store_apps_showing_pending.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fe4d1a28297f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nokiva/fire_retardant_plastic_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/90389898716.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/bullet_journal_setup_guide.pdfIn PDF document text
    • http://xuperag.epizy.com/athersys_inc_annual_report.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5040 bytes
SHA-256: 101480b4068e515b18c4f9a3d6d2b77d83697d36d44214d32b94b2d04451bb5a
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 11980 bytes
SHA-256: 82d63e66717a810d04cc2f57fde46b336f1508f0fe0f74468456f15b43f7397c

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