Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9351d531d94aad3…

MALICIOUS

PDF

66.4 KB Created: 2021-03-14 02:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f2e600d685523db6172fb7f788a1f4 SHA-1: cdfe71479961785648ffdb0a5b9c17f45faca40a SHA-256: d9351d531d94aad39bbb3b03d06c8d391d536476d91f2770a1ffa81e007c0c4c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, indicative of a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://xezojetit.ru/strik?utm_term=stihl+011+avt+cost. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to achieve this. ClamAV and ML classifiers also flagged this file as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xezojetit.ru/strik?utm_term=stihl+011+avt+cost
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/2034616.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/sifabagefe.pdf
    • https://cdn-cms.f-static.net/uploads/4406809/normal_60370cf1ce0d3.pdf
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff11d701577a.pdf
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/99b49e9c76ba543.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5fe414b16fb29.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/1a45e3a0f316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazinibonofobi/1893583930.pdf
    • https://uploads.strikinglycdn.com/files/a4b47c7d-280f-4bd1-b82c-b4c48ba60ee3/weapons_shadowrun_4.pdf
    • https://uploads.strikinglycdn.com/files/218d7226-d85d-4346-a145-0054bb5fa053/ruxijipomunodapilato.pdf
    • https://uploads.strikinglycdn.com/files/398dda65-44cb-480a-9fb3-787efcac7786/jevateziwo.pdf
    • https://uploads.strikinglycdn.com/files/41ed21bc-faef-45b0-ba03-19b73628e891/printable_goal_setting_worksheets_for_elementary_students.pdf
    • https://uploads.strikinglycdn.com/files/c6faea85-f14a-45ae-9ea0-f48269958d4c/puvinoji.pdf
    • https://s3.amazonaws.com/lovomijelun/sex_education_actor_ages.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e4.bin
9098d6eb1ba538056944919e021682b56ee4c8edcc17c235487251760fa3078f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 5148 bytes
font_01_sfnt_off0000d76f.bin
ce833351422fbf059db4e85722c61c5ca2ea4bf5ee7ea6be1c6cc77502953006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 10712 bytes

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