Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b4788b3040a2bc…

MALICIOUS

PDF

91.5 KB Created: 2020-12-14 19:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a2d1126d02bbfc3756256eb6046c6f2c SHA-1: 3a217b317b67847bd8eb15211c6e85aedb84a93c SHA-256: 54b4788b3040a2bc26f9d77e5fe477cdfb8c908a6c440a83a7a1b2220d244a74
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links, with one prominent example being 'https://s3.amazonaws.com/pajeriramal/crime_website_templates_free.pdf'. Another heuristic, 'PDF_URI', points to 'https://traffset.ru/strik?utm_term=pokemon+blaze+black+exp+share'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffset.ru/strik?utm_term=pokemon+blaze+black+exp+share PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f933c3513898.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.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/pajeriramal/crime_website_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8aa178-5dd5-4fe0-9b6c-bc32917f5883/notice_of_association_of_counsel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc576fe6609fd0ee7b05742/t/5fc6d9f03ac9c763f4c5c966/1606867440688/play_classic_skip_bo_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f333e6-6e24-4475-96c5-ab89dbcf8084/nuwajufaraxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e19d87-dd7c-49b8-911b-a44133726ba8/36485400235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ae7858-5ee5-4c26-a697-4f1e67f068fc/jufafagizadipuwizela.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49f91972c46e3c94db3b/1606371833692/watertown_ct_dmv_hours.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000135cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135CD 25424 bytes
SHA-256: cf7960b31cce444ccbdb950a3d6ed8e01e96dce7cdf2ab760b51995da2671a36
font_00_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 5496 bytes
SHA-256: 64f618ec15c522c51796fd770d2c4cc86596c77b20eb6973ac78b8396cd0604e
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 11800 bytes
SHA-256: ef14eb728605c15774e53d285f74101305f56f0499d40f93d2a475110446c7ed