Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ee5c8c95604221…

MALICIOUS

PDF

96.1 KB Created: 2021-04-04 11:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7feb48b9c3f52850fd87851d2b8d2cc5 SHA-1: 23211ccd66247a8712de9b1d3ec062d7bb39706d SHA-256: 96ee5c8c95604221606f1b56618feeed807cda33b7616e9443631d4ed89a0fdb
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a title related to Roku remote issues, likely a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=why+won%2527t+my+roku+remote+volume+work PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5ff1163f70c0b.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/cal_cal_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5fdc16c19b57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_601abcb0a83d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5ff4e04d8fbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_603dff7fe204c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601fb870eac92.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/lasopusemisimuned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_c3cfb848685e426eb9dbda88b8a44041.pdf?index=trueIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_112686ff486c4bc5bfac9da0b6b8ddaa.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_d51eb427d2a14e5797cdbf7cbf07e674.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/nibazesubiduxasikulenivot.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_fd445a59942f4dbbbb1b66e71783f077.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_10f34349e93d4f60a43c80c167d32a52.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_c6b92376a0244413af3d5aae0f8553ca.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_93b15722ae3944c9b33c55653f5c0b5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/algorithm_design_manual_solutions.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_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 4900 bytes
SHA-256: ad5d153ac4b3546eef3db1f7b90c5743dfded45129c76a553d2472742fc20fcb
font_01_sfnt_off00014a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A73 12076 bytes
SHA-256: 6c8745a3cabaf5eaba697b3b4b69e017fe8555aa9aed872bb86c47b247d28577

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