Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfc99c17fc66040…

MALICIOUS

PDF

84.7 KB Created: 2021-05-22 01:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 625469f2ad2a673881b75d836c8570d8 SHA-1: d289ecd517f4dad855a71e2c2b4044684cd731af SHA-256: 5bfc99c17fc66040b2654e8ac64d426ec9a9f0ab522c9c88aaff87ce42ca7b59
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO spam campaign. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially phishing lures, as indicated by the URL containing 'how to find density of rock salt'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=how+to+find+density+of+rock+salt
    • https://cdn-cms.f-static.net/uploads/4419827/normal_603bbf38ec826.pdf
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/5640195.pdf
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5fe8f0f66dfb7.pdf
    • https://cdn-cms.f-static.net/uploads/4530151/normal_600d5614ea6a9.pdf
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/fabuzen.pdf
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/tokenuzopazogu.pdf
    • https://demutarovawo.weebly.com/uploads/1/3/3/9/133997894/5682211.pdf
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/9748555.pdf
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/bc1e013.pdf
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/09021eec5c0193.pdf
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/zaguriga.pdf
    • https://static.s123-cdn-static.com/uploads/4375518/normal_5fed5e4084dc4.pdf
    • https://cdn-cms.f-static.net/uploads/4462368/normal_5fe64e8448e0c.pdf
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5feb1ed7a010a.pdf
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/4428703.pdf
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/larabuwatet.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_60500dc0395e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mozirolinitaje/magijubowemufibewiko.pdf
    • https://s3.amazonaws.com/putelekireza/93839814028.pdf
    • https://s3.amazonaws.com/genedesowul/kemabidoxuta.pdf
    • https://s3.amazonaws.com/litunux/kowewubinibitibu.pdf
    • https://s3.amazonaws.com/savukojubusum/wiliraduzitararozipuzu.pdf
    • https://s3.amazonaws.com/veraxawewib/nofodelikatabago.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010047.bin
174ba0f94bc33a031600c1be7e1658c66533c7425e5b01578167e2f9328fe80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 5024 bytes
font_01_sfnt_off0001117f.bin
babdd15a22620e89402e0496ea7569f8bf5e7ffbe194bf380d6f274de57062ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 10916 bytes
font_02_sfnt_off0001369f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 4324 bytes

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