Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b75878dcd6b0931…

MALICIOUS

PDF

63.7 KB Created: 2020-11-25 21:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9e1922a99ae061d370cfa92a61fb304c SHA-1: bf91a8e48aca0f21e19a305c497e1e76640c1d43 SHA-256: 0b75878dcd6b09311f12f32ba92551dff438bb5a55834bf6963c719d44d502dc
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and are part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffmen.ru/strik?utm_term=the+mystical+vision+of+existence+in+classical+islam+pdf In PDF document text
    • https://metubunotawe.weebly.com/uploads/1/3/4/5/134595280/turetuzubofuwa-xijoseri-girolasalu.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/piruxubowizogoxex.pdfIn PDF document text
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/c4a66d15133e68f.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/2859103.pdfIn PDF document text
    • https://sujegido.weebly.com/uploads/1/3/4/6/134695044/47ee4c7c9602e01.pdfIn PDF document text
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/1593231.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/e10127ac7.pdfIn PDF document text
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/bojekogox_bifaki_dutito_kenotobemewiw.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/aa49663c-c9d6-4e1b-a427-230f2f4ea332/foucault_history_of_sexuality_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9731f03c-cd63-4464-872c-4a1337515f9e/minecraft_astral_sorcery_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312dc669-a6d2-408c-a676-c95f7fa09d39/kiwuzuziru.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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 5480 bytes
SHA-256: 32656150a74a9f733d6b4a4bc5523dcfcc5ff9d5c363af2c4a5c06a5a8e470c9
font_01_sfnt_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 10620 bytes
SHA-256: a33dade94431a49ce1b50e2e4de9f552116bebd6d82ebad89578c9853dce2380

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