Malicious PDF — malware analysis report

Static analysis result for SHA-256 e228c087de1bf773…

MALICIOUS

PDF

65.5 KB Created: 2021-03-18 14:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4df1588651dcde584511710d6c71c51 SHA-1: 11bcf2e331a67b201c489daddbafa88399670e73 SHA-256: e228c087de1bf7730629d22dd3b8c59993f1e2aa4a616169d785890df607607c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest this document is part of a larger malicious infrastructure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/aws?utm_term=texas+instruments+ti-83+plus+cable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd227b20de45.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/gusigagakapiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jjjiiiZ/30325483126.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hf4heja/phoenix_suns_girl_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483623/normal_5fe45fa8ef114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_6003b39f21cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_5fd6230074fae.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/mifolebenujojemiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_601d881cf156d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_3015a39c68d74a3ab37c1f74ca8056bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/chapter_3_the_great_gatsby_vocabulary_words.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/pupagudun.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/pizusokopavutujajigekunit.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/mulawidexibata.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_0472f60b6ed54a18a441ee9058a2bd28.pdf?index=trueIn 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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 5628 bytes
SHA-256: 52e9566ee00fa753dee6653e9f267384275e40e0b2f155dbf1b9ae83b6fcdf80
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10136 bytes
SHA-256: 8f2cebb8cd155b359e2706b7363ecd54e69fcd83d0762d5c95ed6b1650564747

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