Malicious PDF — malware analysis report

Static analysis result for SHA-256 795f01a7d6e6591c…

MALICIOUS

PDF

69.3 KB Created: 2021-02-05 23:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b6775bb9dab7d8329d30d44a84d5ec04 SHA-1: d1592645de3c744637f83c5340e5bd14b8ed6e23 SHA-256: 795f01a7d6e6591c9ae2f1d8e08025cc7a880ea44ce34ee45750c3b743e2f53d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'class paul fussell free pdf'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/123?utm_term=class+paul+fussell+free+pdf PDF link annotation
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/keralu_subajozinasakut_rafenefemeri.pdfIn PDF document text
    • https://cdn.sqhk.co/wowobavukelo/jgcgdjj/28050265539.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/42876.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/3630771.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/3055818.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/jbgeCX4/7851464543.pdfIn PDF document text
    • http://jazejoravasog.22web.org/guidelines_pulmonary_embolism.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/7621103.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hcNTgdm/univision_41_noticias_numero_de_telefono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd26ff4a5616.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/boxuk.pdfIn PDF document text
    • http://nosaraxes.22web.org/ssc_stenographer_2018_application_form.pdfIn PDF document text
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/mijaxajigebef_wijuvosejapimiv.pdfIn PDF document text
    • http://nomokosu.iblogger.org/hong_kong_protest_latest_report.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/getuxe_kapixatuliwe_fozikedaviwabe.pdfIn PDF document text
    • http://pabukelib.66ghz.com/11595837708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukukuwozar.epizy.com/social_skills_worksheets_conflict_resolution.pdfIn PDF document text
    • http://kegeduwamid.epizy.com/project_almanac_full_movie.pdfIn PDF document text
    • http://vezapuro.rf.gd/xojudubenixumaluwegudi.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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 4940 bytes
SHA-256: eac0b054b4f926e75eed6f45fca7919bbd76d08073c792112779828b815cf771
font_01_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 10760 bytes
SHA-256: 521684113cde38e1dc50e2bf40b879c50be257b05c4d0aac505f53aef6c6d6c4

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