Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceedb467ef7c80a2…

MALICIOUS

PDF

78.4 KB Created: 2021-03-04 11:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a11725cd2a18b941c59b788608cfca1 SHA-1: 9f04d405c639281f6cdecf2da98942bebd4e4f03 SHA-256: ceedb467ef7c80a2d34fb4769aedc8cf3255cbc54724676f03157d76213500ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://mezovuduw.ru/strik?utm_term=checklist+for+house+construction`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=checklist+for+house+construction PDF link annotation
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/fulof.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/advantages_of_selective_incapacitation.pdfIn PDF document text
    • http://tibetterrier.ru/81300518891hz0jp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff3ce75ae8d1.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/d1c32b4f.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/1939854.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/f5a3a68.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/27709050609.pdfIn PDF document text
    • http://tevopose.66ghz.com/boating_license_florida_answers.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/amiad_filtomat_m100_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafasegu.epizy.com/akshay_kumar_hit_songs_free.pdfIn PDF document text
    • http://duvodix.myartsonline.com/percy_jackson_sea_of_monsters_chapter_12_summary.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/how_do_i_hack_a_vending_machine.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_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 4728 bytes
SHA-256: 004c35e1501530a11e2a4dd1ed5f519cda43c9a722739ec3fbc04d3892da3d94
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10912 bytes
SHA-256: 6f6f4d35642eccd0ef3d623a3be36920ddc3e3a05e2db70d07d924e1f60b3f76

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