Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f8deb18106e310…

MALICIOUS

PDF

62.8 KB Created: 2020-11-30 02:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6bc13da0525af396efa416a02fd673fb SHA-1: 1fd5fd49e1bf91ec49684a170858d2dc78a4bd8e SHA-256: c9f8deb18106e310f92eafdac8f44a0166c933e103cb1180fda4e9d662034e9b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=psychodynamic+psychotherapy+a+clinical+manual+2nd+edition+pdf PDF link annotation
    • https://nefitajufu.weebly.com/uploads/1/3/4/7/134712437/duzafixosubube.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/66dad5b4552c574.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/plural_nouns_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0ab5f8-acff-42a5-a94c-e36e991231d5/54016530169.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/30983848850.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/kafuzupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9178be81-84f3-4b16-9618-4c2971a3687d/davixitesiwemebesugex.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/juxumos.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/39046981228.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/82962165651.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_off0000b857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB857 5632 bytes
SHA-256: 1f473a29eb5a193089ab0e449db2fc3f839c000b8882ce8d6dfab1a87bda6813
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 10488 bytes
SHA-256: 40cf14b194f00c0355dbaa79230379b23cab27b700dc8f803aabfb08ada57053