Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a28dd748193a3c…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 11:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e583d51be90d1e8e840e1f11f222233 SHA-1: d755d8b5a69200e2a7184dcd4b8b2668bcb33beb SHA-256: 18a28dd748193a3c414ea91aac5c66fae87f90b8366f4173abe3d048c442d122
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=panchatantra+stories+in+english
    • https://cdn.sqhk.co/vukupamita/ALKWgfI/27117714387.pdf
    • http://ximikilanad.22web.org/pejenubovu.pdf
    • https://cdn.sqhk.co/zadorari/jcx8gdO/funny_video_download_tik_tok_mp4.pdf
    • http://duwelizub.mywebcommunity.org/tutorials_point_c_programming.pdf
    • https://cdn.sqhk.co/dogojaseziwo/XAz7igk/losogukex.pdf
    • https://vofodiwe.weebly.com/uploads/1/3/5/3/135350815/wewejabinako.pdf
    • http://bugiwuxad.medianewsonline.com/28832528298.pdf
    • https://cdn-cms.f-static.net/uploads/4475391/normal_604cf16ae1a42.pdf
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5fe136570caff.pdf
    • https://cdn.sqhk.co/wekaradukuve/Ji3z5hb/mobile_ringtone_romantic_song_download.pdf
    • https://cdn.sqhk.co/xivumatozo/SRvJ5jb/ketuvoz.pdf
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/7838661.pdf
    • http://xinuvaro.sportsontheweb.net/how_to_tell_if_washing_machine_pump_is_bad.pdf
    • https://cdn.sqhk.co/wesuwajil/jhjFhbQ/renakirojaziloxivikud.pdf
    • https://cdn.sqhk.co/zapiferufefu/jd5hfjc/whatever_you_want_meaning_in_marathi.pdf
    • https://cdn.sqhk.co/kekotenonaxu/fuJOShh/daily_forklift_inspection_form_free.pdf
    • http://juwupexutaval.mywebcommunity.org/is_harry_potter_cursed_child_worth_it.pdf
    • https://cdn.sqhk.co/vakolitakap/fhgixbU/14327373972.pdf
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/934222.pdf
    • https://gunubamevozapub.weebly.com/uploads/1/3/3/9/133997290/gefojakofosubek-rajinanuxeseb-rujegujeriwefez.pdf
    • https://cdn.sqhk.co/vegedusovo/jEecCUU/assistant_project_manager_jobs_near_me.pdf
    • http://vijufik.iblogger.org/13138360329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xigutawime.epizy.com/actress_savithri_songs.pdf
    • http://jalijoruki.atwebpages.com/39503878570.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_off00010164.bin
52b98a405966604ad5ee994ef55a665803b499effac54f7e0b726d8aed1380e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 5060 bytes
font_01_sfnt_off00011294.bin
8396f1c80fbf6c168eb66d73a3a792150afe1b4031a45bf719f68396e779c3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 10900 bytes

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