Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad18c1ef3de9400…

MALICIOUS

PDF

66.5 KB Created: 2021-02-16 01:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: eaf48038700d877f07073b8309be7ed6 SHA-1: 9197b28b2984cad1fcb177902654adacaeb88488 SHA-256: bad18c1ef3de94004bd9c28c86860b6b925094206b3ab9e0f92371dfec0ff98a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=osage+community+schools+staff PDF link annotation
    • https://babosaka.weebly.com/uploads/1/3/1/3/131379498/5291419.pdfIn PDF document text
    • http://biggymstoe.com/8808422957b0t1n.pdfIn PDF document text
    • http://wemepena.iblogger.org/59628086703.pdfIn PDF document text
    • http://arm-watch3.club/wezisobitetixirki1vp.pdfIn PDF document text
    • http://dovulup.iblogger.org/puguwililasodixukurilat.pdfIn PDF document text
    • http://mrshadow.net/96143897124okgpz.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/7811104.pdfIn PDF document text
    • http://devlp.design/gagavosasipesemelah3wlb.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/jawixasotoxixubaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_600f8bea5ce64.pdfIn PDF document text
    • https://tapevasazizile.weebly.com/uploads/1/3/1/4/131454670/6893efa.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/hunter_street_season_3_episode_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_6003a7cc30045.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/5dcbfb2e17d2d3.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/sabegokek/71435393491.pdfIn PDF document text
    • http://tikikenuf.epizy.com/50782932623.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/35726730100.pdfIn PDF document text
    • http://nibijifituvi.epizy.com/phn_mm_chia_nh_file.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_off0000c4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 5328 bytes
SHA-256: 4616b0a760f78d9b250c9e27f44b8af364bf6fc7c4b928861a42f310326f74c8
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 11372 bytes
SHA-256: c8cd3908a22e766d31d6754587b84a969f7e2012cce2a1896c73808b8c5ffe77

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