Malicious PDF — malware analysis report

Static analysis result for SHA-256 21daad0b4a5fa2b2…

MALICIOUS

PDF

64.5 KB Created: 2021-02-22 21:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9ef823b0b028e365bfbefdb52d783e0a SHA-1: 93ab5219b5f7a8c391ff9dd7fcbaf5ebb7880013 SHA-256: 21daad0b4a5fa2b2f2fc8e50492f6bcfdd58b8b5b97f8640af781764d1e1d3f8
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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
  • 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://maypoin.ru/strik?utm_term=what+is+a+21+day+challenge PDF link annotation
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/xenif.pdfIn PDF document text
    • http://beststudent.fun/pezazofupeteh6des.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/c14127.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/what_causes_coliform_bacteria_infection.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/iRb8hjj/dogonukikizefatodoba.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hgipAja/rizeremozejarakegikoxiva.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/7266260.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/tajepusiza.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/ehgMMrE/vumefogoxiva.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/i7hjhhD/dj_name_mixer_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/ohenXje/flight_simulator_2020_xbox_series_x.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/kusurozizuropit-monalikotoro-ratujirat-viduki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damatagowigiz.epizy.com/27223969367.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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 5404 bytes
SHA-256: 25795a6198bb9e49ff2696ea955ae5dbaa31a04024de123e55b645d7d1a04e8f
font_01_sfnt_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 9208 bytes
SHA-256: bbdea338986ac73d2fdc7c33d85d777c967a08c1bc0e8c55415d7c3ec9b061db

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