Malicious PDF — malware analysis report

Static analysis result for SHA-256 448e541da022ce29…

MALICIOUS

PDF

65.4 KB Created: 2020-12-17 00:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1116f70cd35a358dd1ae0e6f5973060 SHA-1: 4cc4960cf731bda70d96e8c0212ffc9ebe62b08f SHA-256: 448e541da022ce2940feac139c9b46df516756721e83bef8d44bc40965a0d694
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, which is characteristic of a link farm designed to redirect users to malicious sites. The heuristic firings indicate the presence of malicious redirector links and a link farm, with one URL specifically associated with a known malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://gettraff.ru/strik?utm_term=biology+chapter+12+and+13+study+guide+answers
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/muropuxuvorew.pdf
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd773f869db8.pdf
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/padixejo.pdf
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/rezopofevezeri.pdf
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/demejepoluxaj_nexofefidarun.pdf
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fce626c375f0.pdf
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5f986464adcc9.pdf
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd2ad69eb9af.pdf
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/dabiwikular.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bokelur/seninuwoguxesuso.pdf
    • https://s3.amazonaws.com/zirojopemup/zunekitav.pdf
    • https://uploads.strikinglycdn.com/files/7ecf4442-94b0-43bb-ac22-eca9c5bf42c3/behold_the_dreamers.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_off0000c27e.bin
fab8622e240c4ad4c413d9e2f6970f40e3c3c065bf978739332e6a8a80c2c274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 5928 bytes
font_01_sfnt_off0000d6c1.bin
fc4206a5f5e27e8b7599545c63703a6665d170ae98bdb0980a7bb50c3d4a1158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 9964 bytes

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