Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a48b3ba4331df7c…

MALICIOUS

PDF

95.0 KB Created: 2021-06-10 00:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 04a2de487072780c5195760c35e180b2 SHA-1: 8dbd93cc3867e7a6bb5bc8091d861f34e1586c73 SHA-256: 5a48b3ba4331df7c3e5d31437333acc97cc65088ce652cb063f6fc153d3ae9e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to 'Dometic comfort control center 2 thermostat troubleshooting'. The primary malicious URL identified is inwebjor.ru, which is likely used to host a phishing page or download further 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://inwebjor.ru/wb?keyword=dometic%20comfort%20control%20center%202%20thermostat%20troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481271/normal_603429d773163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_6068d47c8949e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_60445a6ba2cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_60bd17d82dea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_5fda94f4a4bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6026196bc6dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60ba2c0aaf18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fdc8cd72bbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_60bcb443a5eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60224d0b16d87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutupum.pbworks.com/w/file/fetch/144630693/pradeep_chemistry_class_11_free_download.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144503031/4059900775.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144426894/jasisusirelujoxofut.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/f/gifted_hands_full_movie_free_online.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144939132/owa_web_app.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/f/1495401180.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/family_dollar_printable_job_application.pdfIn PDF document text
    • http://lovixov.pbworks.com/f/rutil.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_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 5564 bytes
SHA-256: cf20f6466ac455afb05343341fa182b841984206dd87eda94bdaa094d86c971d
font_01_sfnt_off00014600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14600 12104 bytes
SHA-256: e21d44ff7883d86b7f6234665af708728f78439e81c3f13ed6b9d90de92696e5

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