Malicious PDF — malware analysis report

Static analysis result for SHA-256 512956855debe481…

MALICIOUS

PDF

76.1 KB Created: 2021-03-26 08:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 773139c6b55157ae8c6ef76bb27ee056 SHA-1: 2d4d99cdb9bfd636762f562d5b5dd62385e9847f SHA-256: 512956855debe4814db9388a2c25c12e710c79a05b9bba01a6ca3550502b1c65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=can+you+refuse+a+deposition
    • http://devlp.design/verbal_reasoning_practice_questionslabu8.pdf
    • http://kellys.space/what_are_the_most_important_excel_skills3de1v.pdf
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/vujenexo.pdf
    • http://odemebayisitrafik.com/how_to_fix_shark_steam_mop_not_steamingpdica.pdf
    • http://abzac.me/huawei_health_apk_download8acg9.pdf
    • http://heartcenteredequestrian.com/film_basara_season_4_sub_indo5xafj.pdf
    • http://xawegap.mywebcommunity.org/what_are_the_6_conflicts_in_literature.pdf
    • http://alsamcctv.com/96088538185q6kd4.pdf
    • http://rezonansmusic.com/88619014935kn0xy.pdf
    • http://kittyplay.online/does_starbucks_still_have_sugar_free_mocha667le.pdf
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/3c204a.pdf
    • http://clebohets.xyz/44703334815jmpx6.pdf
    • http://hookup754.fun/what_can_i_use_instead_of_a_diaper_genien0n3x.pdf
    • http://detonic-official.website/mofumakamiga2xbn1.pdf
    • http://world-wild-shop.com/strategic_partnership_policy_defence8yvzr.pdf
    • http://moviesaddaa.online/alfa_romeo_159_parts_manualv26kd.pdf
    • http://com-copyrighit.com/meaning_of_knighthood_in_urdu_and_englishkgp50.pdf
    • http://pasikufopubiwo.mypressonline.com/certificate_of_proficiency_in_english_4.pdf
    • http://trysalon.xyz/the_crown_season_4_episode_7_charactersapqs1.pdf
    • http://tehnoprom.org/98734296041mv92n.pdf
    • http://kayikciakademi.com/69931897165k7qs4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bugenerefajujus.atwebpages.com/telecharger_les_blagues_de_toto.pdf
    • http://zejibanunepi.myartsonline.com/information_bulletin_neet_2020.pdf
    • http://bafuwujix.atwebpages.com/genie_intellicode_ii_instructions.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_off0000eed0.bin
3e5585a4311edaad7edf488873265ad339b047fd9096a5cad00e621b7ea3aa56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5012 bytes
font_01_sfnt_off0000fff3.bin
be8e428d6846d2b0b6601168a5699732f1a043777416ae9e17bac4b5b197baf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10340 bytes

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