Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8cda3e68d763d3…

MALICIOUS

PDF

72.2 KB Created: 2020-11-22 18:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3deae34508b122ff27f069ba04eef649 SHA-1: e19b06f162fcb411cb8ab80e3e3fd5dbfd06dec1 SHA-256: 5f8cda3e68d763d3bc724932f69e066c8b44f112c5fb74bbfc4c8c27b0f8c7f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a primary suspicious URL being traffset.ru. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for executing malicious actions within PDFs.

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://traffset.ru/123?utm_term=before+watchmen+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fad353474ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f90cde474c5a.pdfIn PDF document text
    • https://tibuvaji.weebly.com/uploads/1/3/4/7/134720571/5bbbff8.pdfIn PDF document text
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/4562bc0b85ba6.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/1729804.pdfIn PDF document text
    • https://sojakibozalejew.weebly.com/uploads/1/3/4/7/134747186/9829400.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/fimewef-kejupabege-reponev-nuwab.pdfIn PDF document text
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/3005042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fa33940e7a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fa25bd77762e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_5f950d6eeed1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5fb8cb9985cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fb35335c4659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69232f24-1420-4065-bd72-4e5d3ff96abe/jusenarewugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b40642-b026-43b4-a2ea-45717242792b/28408496602.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 5324 bytes
SHA-256: 2ada593255d05d99f6f978edc5c57c964a8197c4fc91b9a80de6a5eac3a1cb73
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10504 bytes
SHA-256: 080e191f792ead05e0ec87322fa4f371ebf88f253f710ca06acd6dd11722163e

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