Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafe2138396cc378…

MALICIOUS

PDF

86.6 KB Created: 2021-02-20 20:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2cef1303d816fe1fa690256b9643dadb SHA-1: 88b9774c5cfbde037023caf6f50ad17e1d3c0c92 SHA-256: bafe2138396cc3782d80252a2b21e6af7cda9269db0a285833c9ac61530e2f97
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. One of the embedded URLs, 'https://druttle.ru/123?utm_term=marques+de+sade+frases+moral', appears to be a primary lure, while another, 'https://static.s123-cdn-static.com/uploads/4461485/normal_5ff4c29f48a4b.pdf', is part of a detected link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=marques+de+sade+frases+moral PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5ff4c29f48a4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5feeb11acb429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_5febdb2700e00.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/13683373e10430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5ff29208b4ef0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419001/normal_60093f32641f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fcdf1e84dd76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fd9f7930fccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481280/normal_5febe11df342f.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/temujonuwu/ben_ten_omnitrix_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/bootstrap_form_checkbox_size.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/jofawata.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/transformers_bumblebee_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/26739190727.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/54659168553.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/toputegatalopexumitigoze.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/1995_jeep_cherokee_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/gramatica_para_aprender_frances.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_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 5184 bytes
SHA-256: 3d0cc604b2a8b4d3fa180d2ce82d96b4fc3a71454bd62c1fbba2e618f49f099e
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 14704 bytes
SHA-256: 217adc941d82abf1f1a2dc862758e96ba839646f62ee9463c203b71a9700cbb6

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