Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe0f02b5a968189…

MALICIOUS

PDF

80.4 KB Created: 2021-02-10 07:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 66fbf8b76479ce136587acccf6389a8f SHA-1: 5a09dae1948ebe18a6c2709c3cc530e7323063ae SHA-256: bbe0f02b5a968189a276282258ee41b8f1527a90faf05ee634ef683d238745f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm hosted on disposable domains, with numerous external URLs embedded. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pathfinder+ring+of+invisibility PDF link annotation
    • https://cdn.sqhk.co/tijinujul/c2UwgcU/87860869876.pdfIn PDF document text
    • http://zuvakaxosamota.22web.org/71467075269.pdfIn PDF document text
    • http://gobuweba.22web.org/bonizenipo.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/7jcLeDM/phoenix_theatres_kennedy_mall.pdfIn PDF document text
    • https://kebafilononuxo.weebly.com/uploads/1/3/1/3/131378837/3d85180.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/Tjcrjaq/pejabibononajet.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/gdjiBjd/15294195051.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/disumapuri-bosoxixa-farapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirajog.epizy.com/airtel_busy_caller_tune.pdfIn PDF document text
    • http://nezopodadas.epizy.com/dazusixolinozotadoma.pdfIn PDF document text
    • http://bumemelowogo.rf.gd/91293186526.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/40435760935.pdfIn PDF document text
    • http://kapugekemasili.rf.gd/64897174120.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/22315256452.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 3668 bytes
SHA-256: f86f7c1cd5cc3399c1ef483d10a9941c55c9b87b164775ee957257211d3cbc43
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 5472 bytes
SHA-256: 777ac06a6393e25eb88a031d444c91e4b3f5ff364b4e1bfab1ce6b08385ad98e
font_03_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10980 bytes
SHA-256: 742587a89959171518ce67eec5a39d19545b772e38fcc589bc830f846114440d

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