Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d90d2229beb977…

MALICIOUS

PDF

81.5 KB Created: 2021-02-10 03:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a25f856ddc21791a43c5255bc18d2926 SHA-1: df05b6ea5935dcb9a060379923db82de707c5394 SHA-256: e1d90d2229beb97704117f79a1acb9efcf50ec3032a4fede880a88948ff1e7af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains multiple embedded URLs, with one specifically pointing to 'bologen.ru' and a 'utm_term' parameter suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=choke+coil+pdf PDF link annotation
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/9854720542877.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/saribonofo-pipimugizaroli.pdfIn PDF document text
    • http://vpntop.info/lutajegapbuczg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_600ff292d17a2.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/pelevevinuziguxofo.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/fFbwVhi/wofakotur.pdfIn PDF document text
    • http://werenntaq.online/firejumpers_sandbox_full_version_apk8ipae.pdfIn PDF document text
    • http://anrostore.ru/18722455206rahhy.pdfIn PDF document text
    • http://pocki.top/zimisitobunevabufufrvi0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butopam.rf.gd/108899142.pdfIn PDF document text
    • http://bufafaloverodi.rf.gd/habbersett_scrapple_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/life_comfort_fleece_sheets_full.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/algae_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/50003900461.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 4728 bytes
SHA-256: fb4fedc2bcbd69ae4817008ee045ba7df8304dde8ea3d181fbfaa66d873afd7b
font_02_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 11648 bytes
SHA-256: b0a0e855c919e1f46d59b1b668db0ff5bb923f4abebf161180c735e19610779b

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