Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a4378b241774b6…

MALICIOUS

PDF

72.5 KB Created: 2021-06-13 15:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e7b3527a981bb44f16a3f6de503cf4 SHA-1: 1ad5215ca1511d6a9ca5ca6598041fb57d1b67d8 SHA-256: 68a4378b241774b6cb66b5d4d4d4e66d9c2a02e28d78669278e746fb2f705a60
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=usb+11+n+adapter+driver
    • https://cdn-cms.f-static.net/uploads/4447252/normal_5fd84aedc80bb.pdf
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/zadevu_diwez_zazezagarulotu_luwegufelono.pdf
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/fatonozogazami.pdf
    • https://tabekobos.weebly.com/uploads/1/3/4/8/134869214/5228849.pdf
    • https://static.s123-cdn-static.com/uploads/4385217/normal_5fcb9e4d92f67.pdf
    • https://cdn-cms.f-static.net/uploads/4416656/normal_602983fade6fa.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_5fd9f28d9cb76.pdf
    • https://static.s123-cdn-static-d.com/uploads/4465905/normal_60b2775a8aa2f.pdf
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5fef006d2981f.pdf
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/lawirozowutogebiwo.pdf
    • https://cdn-cms.f-static.net/uploads/4413226/normal_60687cfef19b3.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/tiged-powubafevo-zegodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kufavuva.pbworks.com/f/rumevigitoxonuloxomo.pdf
    • https://uploads.strikinglycdn.com/files/676bc774-28c2-4cb8-b2b8-e88ea1be2699/tanitizulepipawetimuru.pdf
    • http://rerikisozid.pbworks.com/f/how_to_use_airline_incidental_credit.pdf
    • http://veposasidot.pbworks.com/w/file/fetch/145081506/a_aa_movie_songs_download_naa_songs.pdf
    • http://jubitelow.pbworks.com/w/file/fetch/144861312/what_is_the_theme_of_stranger_things_season_1_trailer.pdf
    • http://doforegapuru.pbworks.com/f/mimawanap.pdf
    • http://jizakatum.pbworks.com/w/file/fetch/144613995/midarupiterotevat.pdf
    • https://uploads.strikinglycdn.com/files/67fa51f1-ebdc-497d-aefb-e6e21fcfa87e/58346058742.pdf
    • http://tovovojufa.pbworks.com/f/how_long_do_you_have_to_wait_to_evict_someone.pdf
    • http://tirotibixup.pbworks.com/f/how_do_i_write_a_temporary_custody_agreement.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddac.bin
4126248299768821e52748b386e3990f92b70c5f5cb2bb1e13fbbca73a5d1ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 5164 bytes
font_01_sfnt_off0000ef53.bin
8d020189831efc69cd2f95dfb761e0943604e539ec61c2288f84a21a5ef9a3de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10844 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.