Malicious PDF — malware analysis report

Static analysis result for SHA-256 23afe143934282a6…

MALICIOUS

PDF

74.6 KB Created: 2020-12-01 22:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a5f50ac2cafdd90b91999f78d46bbb78 SHA-1: 603a4b21d51042774b066eec045913f4a9eadabe SHA-256: 23afe143934282a65beb684cdfa201d9007028cc7aec07061038c01f1cdaf642
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly hosted PDFs, indicative of a link farm or SEO spam tactic. One of the primary URLs, 'https://trafftec.ru/strik?utm_term=rome+cinema+movie+theater', suggests a lure related to movie theaters. While no scripts were directly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafftec.ru/strik?utm_term=rome+cinema+movie+theater PDF link annotation
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/bbc675ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5f9e83a9cee5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f8ca11ed1961.pdfIn PDF document text
    • https://mebijakonenu.weebly.com/uploads/1/3/4/4/134458360/1918481.pdfIn PDF document text
    • https://nutawazozi.weebly.com/uploads/1/3/4/6/134699679/1485546.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/3381289.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/9575900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f90e979a0867.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/92b21117-639b-4387-b7e1-41da1b724d87/summary_the_storm_by_kate_chopin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296cabb7-2d9c-4eae-b50a-8355e8130c68/moparotaxazowitisif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12501c9-509d-4433-b2bb-e4463f9a1871/niduxanuraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ed96a3-1e9c-4985-919a-6a3cdbb37ee5/94090214307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5473b6a-4770-4ea9-b4f9-09c25688ee68/panhandle_eastern_pipeline.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 4896 bytes
SHA-256: 2c38eacba1da2d8f56c7597afe57bf715e4ad3176a2cf16397d1bc0d99c8f33e
font_01_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 10992 bytes
SHA-256: 2b880d8c11c50bccae89affe1a4dc5eff55e40012693d0bc76a5512b4e0911bc
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 17072 bytes
SHA-256: cb02a4d557d3b38ce31daa07ae713ed591513bd197c7b9b5d2f05cdfc4d1cc55

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