Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc6e34606447d03…

MALICIOUS

PDF

85.6 KB Created: 2021-02-22 10:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e83696a41580ad2443efb0f5600d1ef SHA-1: 56b8c05e5657beaddbf5f82365ac4410277f3ef3 SHA-256: 6cc6e34606447d033657dd8b2320e2f8942e6d160cb2d387cb5051e1141ba3f4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links point to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The document body itself is heavily obfuscated and contains metadata related to its creation by wkhtmltopdf, suggesting it was programmatically generated.

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://bologen.ru/123?utm_term=libros+de+economia+y+finanzas+pdf+gratis PDF link annotation
    • http://souve.me/all_smash_sword_fighters4vx5e.pdfIn PDF document text
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/nigupu_jikerilugixap.pdfIn PDF document text
    • https://wegesunovajoj.weebly.com/uploads/1/3/4/8/134887244/356913.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/iejdAan/can_knockdown_3_apk_hack.pdfIn PDF document text
    • http://rezotu.xyz/game_sound_designer_salary_ukugl08.pdfIn PDF document text
    • http://vinograd.io/the_art_of_the_start_guy_kawasaki_pd2ozji.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/Yhjjfib/wetetolosasasogibitokad.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/opBgihg/vova_boutique_euclid.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/ihcgdgN/get_100_likes_on_facebook_photo.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/Zhbgj70/gun_fu_stickman_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/EhaEt3f/simple_list_of_the_10_commandments.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/Nsxgiez/27234009891.pdfIn PDF document text
    • http://erkutungotu.com/papinasesowarn2gu2.pdfIn PDF document text
    • http://artelamp.store/xelapodapekozexivavavopilhrrv.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/9659250.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/7hgzoje/rezilakewoje.pdfIn PDF document text
    • http://sallehq.xyz/lezojunopukilotazokrxoi.pdfIn PDF document text
    • http://snt-br.ru/mikumixuddl4r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 5676 bytes
SHA-256: f728fc09f1ef94c951287bd3e1521c2b258742e027a9f7e1c4023f09eab2e03c
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 11932 bytes
SHA-256: e584ae086f74758f7820ab2bd5beba0ab4f7f0bfbac2e43fa28672d82ccc0782

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