Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f7d21a763cfe4b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-10 19:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1a6981daced9a947ed781f910b7ff2ed SHA-1: ffcb584866b7c3f7f21cd87bce7ab2fbee0e7035 SHA-256: c6f7d21a763cfe4bda4e85eb34a23a83f91c9cb65a91096786acae9ec5b27a80
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, indicating a link farm designed to distribute malicious content. The presence of embedded URLs suggests an attempt to lure users to external malicious sites, likely for phishing or malware delivery.

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://crophysi.ru/award?keyword=author+s+tone+pdf In PDF document text
    • https://bopegaxuz.weebly.com/uploads/1/3/1/4/131406849/nedikipopimupiviji.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/NgiijJ5/excursiones_cruceros_msc_musica.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/focusrite_scarlett_2i2_3rd_gen_studio_packfwy2e.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ieLjcgi/67464230114.pdfIn PDF document text
    • https://joxorarosod.weebly.com/uploads/1/3/3/9/133999743/d96d449a3.pdfIn PDF document text
    • http://digtalcaliper09.xyz/52741909027dcnym.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/Ejahes5/57087484410.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/wgcjc32/sierra_7_tactical_shooter_mod_apk_premium.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/neris.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuxinekowa/cVicidq/bio_ia_template.pdfIn PDF document text
    • https://texosubos.weebly.com/uploads/1/3/4/7/134715033/4563187.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/hRZictC/mario_maker_2_8_bit.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/2f84a1f0-1252-4ace-8270-bd7838edea20/viduzujewejupumozuzajoxez.pdfIn PDF document text
    • http://fivasire.rf.gd/34003373227.pdfIn PDF document text
    • http://jawafezirosozo.epizy.com/affairs_cloud_december_weekly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badd38d1-029d-459e-b8f7-41c05f1e7491/dafodenej.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/14536013207.pdfIn PDF document text
    • http://tukaxowelu.rf.gd/philadelphia_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb2f2fa-b2af-451d-9517-445848119af5/bexine.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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 4876 bytes
SHA-256: 8c497ab191bc4ece687dee21b924775eaea63b6f521503ebd22a4c2f453e2919
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10436 bytes
SHA-256: ea77d26727be6ad7d561a18ebe2bf214da41dea6a1bd90137ad93ae335028d6a

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