Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5e9b52428c5081…

MALICIOUS

PDF

78.9 KB Created: 2021-03-27 12:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6d27d1dc615634678915ece409518205 SHA-1: d089bce1ac6a7804f671e279e4f37eee62d93ddf SHA-256: 6c5e9b52428c5081d72ece3474bd03a0d61ff30e1fccc4e4d85091e2ba1809e8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a potential lure pointing to `https://golowaki.ru/strik?utm_term=amc+12+2018+pdf`. The PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=amc+12+2018+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481834/normal_6005327a45a77.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/jgijaic/2nd_grade_math_review_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_601976484cf6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_6059722987764.pdfIn PDF document text
    • http://ig-socialmedia.xyz/billie_eilish_images_2019sy1ia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412396/normal_600150ef2c3bd.pdfIn PDF document text
    • http://verenica.net/what_does_evolutionary_developmental_psychology_focusbdq47.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/gjE4gjf/just_smash_it_coupon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fffbd684d9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6021a2e2b6fb0.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/vamevoja_wepanerapuk_wegopudakozovu_wanovitifurire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fed683a411c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jb57Jic/32421933762.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/ba89ca6cf6e8c0.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/igjjhgq/nick_sports_logopedia.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/fawupalugejapamurevu.pdfIn PDF document text
    • http://urro-hu.com/mekivukuxapipadibajo3wsia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_60263314cada3.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/ee91d63f-f9a8-4848-8b24-22b5c4223bcf/forge_book_by_laurie_halse_anderson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab850e-81a3-4e21-aab7-26f6daec78cb/they_say_i_say_4th_edition_readings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6084e9b0-3123-4f99-90b0-10ec3956933b/how_to_write_up_a_medical_case_report.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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5292 bytes
SHA-256: 3e0c9a83083798929b24cba6f9a126b8298b738c31fc1416e806d2db940530f8
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10956 bytes
SHA-256: 0cc10eec99153eb82070adc408a51f3b6fb2b8811d0483f6385c5289d2e27ba8

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