Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbb823fbe120da4…

MALICIOUS

PDF

98.5 KB Created: 2021-04-24 07:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d8601d32f6dfe1fd17c695b0e16eb76 SHA-1: 7328da91646d742e94fac643318a4607fc607d99 SHA-256: 8bbb823fbe120da4d41a52385ec2f187bcd78a9a5526c1e59f890655ba3b2e6d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains a large number of embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=garmin+zumo+660+mount+cover PDF link annotation
    • https://cdn.sqhk.co/mawodoso/hjGYgdx/nitro_street_racing_3d_java_game.pdfIn PDF document text
    • http://esclick.pro/thrill_of_the_chase_book_onlinenogo3.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/BjaijfJ/bwv_582.pdfIn PDF document text
    • http://card2card.live/download_game_shadow_legend_stickman_revenge_mod_apk5i5zo.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/rationale_zahlen_koordinatensystem_aufgaben.pdfIn PDF document text
    • http://begdas.space/36720036242vpelc.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/YgeBjcf/cross_stitch_kings_mall_gujranwala.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/ijcwKjg/34154013478.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/32602272004qdwvr.pdfIn PDF document text
    • http://metazoaapc.fun/what_questions_will_be_asked_in_a_teaching_assistant_interviewb7oa1.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/6iapXGL/belazineb.pdfIn PDF document text
    • http://numaronenoxemen.22web.org/77335951393.pdfIn PDF document text
    • http://reduslimer.website/how_to_get_a_postal_address_in_irelandtkh32.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/jaSUjfx/heroes_a_grail_quest_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teruwizirazi.rf.gd/fepesoduxadeban.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/77550052675.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 5172 bytes
SHA-256: 9f9790d06c010262b38a35eb361268c9317b4262d0683a9bed3ccbb6feccf52b
font_01_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 11432 bytes
SHA-256: 61fb128c4189eb8deda79221bcd9717cdc90ae875aea1c145aeb69ff2a491f16
font_03_sfnt_off00016460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16460 16660 bytes
SHA-256: e7fcb312749b899b31f30f2a6d27aba9aac6e91f12c279fbbfda0fa187017d03

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