Malicious PDF — malware analysis report

Static analysis result for SHA-256 90631536ce4f43ab…

MALICIOUS

PDF

66.7 KB Created: 2021-03-10 02:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 10dfe592165368118a29043dc26b39b8 SHA-1: ad6186bdaee20cd42e0c9c7784dc58c57b5f9d28 SHA-256: 90631536ce4f43abd223dc60875297c2222d6bbd0382231076a26095d457caa7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, possibly for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xezojetit.ru/wix?keyword=annie+john+pdf+download PDF link annotation
    • http://nepoxiduvilej.scienceontheweb.net/the_vampire_diaries_quiz_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/ggdicQr/8_bits_video_game_ringtones_free.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/d4145864730f9.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ibgFyVc/supusoforezorebapujari.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/yzgjjbl/general_electric_stock_news.pdfIn PDF document text
    • http://muwilagugo.iblogger.org/cancer_de_pulmon_escamoso.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/11607525565.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/ep7FgfM/34460880588.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/55406579828.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/8Zo0SFE/mopagesupafisibesamanivaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hieWs3z/zombie_commando_shooting.pdfIn PDF document text
    • http://fuluwube.22web.org/adblock_plus_failed_failure.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/jdiijgh/slingo_garden_play_for_free_online_play.pdfIn PDF document text
    • http://volomowoxe.22web.org/44120714825.pdfIn PDF document text
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/wexisilatas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tonunipuwe.rf.gd/masum.pdfIn PDF document text
    • http://noroved.myartsonline.com/xalelonenevalotilepugove.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/sylvania_portable_dvd_player_charger_walmart.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_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 5012 bytes
SHA-256: 1a4233a71ae0ea31516c1bcaa05c2bf63f6eb3166ab5f8f47a57b5b36ed2f85b
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 10252 bytes
SHA-256: 41878a1fefdd234cf6da214bc1847041b5abd54fa13c2c9ac48f09f984b451da

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