Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54edf185cd21f04…

MALICIOUS

PDF

93.3 KB Created: 2021-02-28 12:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 918db5e80949dd1e6eb94c69ebdde379 SHA-1: 9a3159956a000f4f7e52c4fdcc92eda8fce7b835 SHA-256: e54edf185cd21f0415169986e498a583e94dc498a4a8b1159ff0bf2a948bd20d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=simone+de+beauvoir+second+sex+chapter+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fd1820498410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fe98db8c40b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_6024609cdc126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_601f318ec5286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_600d41c0d190b.pdfIn PDF document text
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/f887c87.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/kawuzi.pdfIn PDF document text
    • http://faromobipon.22web.org/app_mediaset_play_per_smart_tv.pdfIn PDF document text
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/1238082.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/genivevidiguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masekafisixovok.epizy.com/tujaxipowa.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/adobe_after_effects_typography_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/march_grandioso_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/flsa_guidelines_exempt_employees.pdfIn PDF document text
    • http://jizizubusede.epizy.com/are_inflatable_hot_tubs_any_good.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_off00012c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C33 5756 bytes
SHA-256: 019770c49fc2f1df364672b2dfe8e24b2e3e2aed585c6286cdecab298e981b74
font_01_sfnt_off00013fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA4 12140 bytes
SHA-256: 881c31cfb17d50271be9cb377aeb3387fecf21c9a71876b7254ad5eb6a768394

Open this report in the interactive analyzer, or submit your own file for analysis.