Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de1847f67f0a7f…

MALICIOUS

PDF

108.8 KB Created: 2021-04-08 23:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 765232304875960e7dc72d57806fe9c7 SHA-1: 09fce8cba95ae4d4f8b2c9ad414c87e42d375278 SHA-256: 66de1847f67f0a7f573b4f6a125058d0e8e907cc545a5253d64c900dcdcdfba7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to suspicious or disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=the+dark+knight+script+analysis PDF link annotation
    • http://witikotuxigere.scienceontheweb.net/jedakod.pdfIn PDF document text
    • https://fokubazukif.weebly.com/uploads/1/3/2/6/132683137/c792e04af4e.pdfIn PDF document text
    • http://xuxazefovudiwe.iblogger.org/91496353988.pdfIn PDF document text
    • http://bopigupuwag.iblogger.org/4639538761.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/72562616259.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/mobolakizux.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/6414713883.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/vetisesuf.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/a451733a830af.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/4089142.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/dadodiforezewafadi.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/7de5e819-ce6c-4b8a-b2b9-5306d9335b94/73042758061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f744f77c-40c4-4374-b95e-b379c6b3dca7/6043442263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0140e89e-60bd-4dd6-8f0e-3fda948a259f/64218636647.pdfIn PDF document text
    • http://sudipefenivu.rf.gd/thesis_defense_ppt_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5462a94-8f78-4446-9a5d-18d1b14d4953/gurinofapelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c9d4da-c623-49b1-93b1-16adbfc58454/kobizedufiwog.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/xopamiminetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7711e8f0-9bd1-4022-90df-c99270c5dcf3/is_there_an_app_that_can_solve_math_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d7b197-72b5-4da6-a8b4-0bc0033ec2f6/mens_health_training_guide_muscle_after_40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a91cf1-fa88-4786-bda9-fe2b87926aeb/68357535216.pdfIn PDF document text
    • http://pumonufagatoteb.epizy.com/potassium_correction_guidelines.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_off00016beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEB 5448 bytes
SHA-256: dea2695c938226fcb1ac6370866221c6e0749b3cba649969da1a5f6ae8bbe32f
font_01_sfnt_off00017e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E7B 11732 bytes
SHA-256: a15dc5b870a0479923b4e8c287faceb2e371b60ea78869a277b97c577040964a