Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6816b5142fb26f7…

MALICIOUS

PDF

82.3 KB Created: 2021-02-24 11:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a351fbe7bf24bcb1fb525778925a95bb SHA-1: eeabcd335c43d8555b8c1b73c9ecd80073c1bba5 SHA-256: b6816b5142fb26f7215e091a0e8d43a6aaea89cfb9b151cfbe14681cd68945e0
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on 'druttle.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users.

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://druttle.ru/strik?utm_term=babok+v3+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486965/normal_60179bc064d06.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/4Rjbjan/58283205368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6024335ca69c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6016589b963c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fc87a22b5029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fcf616a3c0c9.pdfIn PDF document text
    • http://towajemikof.iblogger.org/72142351080.pdfIn PDF document text
    • http://tufilevazoropiz.iblogger.org/97749817898.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/2041576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_602eb3736706c.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/tigovatolis/lexeduvotanikolon.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/why_wont_my_fitbit_versa_2_connect_to_gps.pdfIn PDF document text
    • http://kuwademepekipil.epizy.com/89810249216.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/python_apply_function_to_dictionary_values.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_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 5292 bytes
SHA-256: 8aaeb1b9bae438872de02883f7565c2db24e9d4f0c7440b41fbec5002a5899f9
font_01_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 11652 bytes
SHA-256: f49ee8502914650318388314718d19231e062a3dffff48a0b0a5829f930565b1

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