Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c19d38c029debc4…

MALICIOUS

PDF

81.9 KB Created: 2020-11-11 06:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0f8abba9b4c51540d3b896fd0e4906d SHA-1: 7dde47d514485d14672037e5e91e46ad506d46c3 SHA-256: 0c19d38c029debc482a0c751cd3738e916149151987609e86b713d025dae3b9a
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to external PDF files hosted on link farms. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?keyword=desiserials+star+plus
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/dfe5471fa8.pdf
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/vamojidufubatanekuz.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5f8f72746b1bb.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/038b7.pdf
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/2528331.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/fezoguguboxavo.pdf
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/fuxubebama_gunasewexabimo.pdf
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/sewogopuruxagipo.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/1933395.pdf
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/bonamab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zewimu/71331347388.pdf
    • https://s3.amazonaws.com/rozebofukixus/37048874135.pdf
    • https://s3.amazonaws.com/lixuzo/jaludotes.pdf
    • https://s3.amazonaws.com/midipes/53957718011.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_off000104b1.bin
1485886f12445e88b712ba4bd673fff21650d2077d72d56fa9e92293a3491848
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 4812 bytes
font_01_sfnt_off0001151e.bin
5f5c2331312ea6f41bb0e4b1156fc26320cb781f239494bc5c371c28ec889d83
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 11180 bytes