Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73f1a176e586c9a…

MALICIOUS

PDF

78.5 KB Created: 2021-04-05 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80ff651c0f7c4c0b640d69eb0434f3ab SHA-1: ae0573f0bde8d14239a6df472c2a1d9bbd8ec7f8 SHA-256: b73f1a176e586c9a4f7f6c646e9dbd77e8a5a1549ca0c6b1aacbc0f13f7d62ed
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with URLs like 'https://lozipotod.ru/strik?utm_term=who+is+in+girl+interrupted' being prominent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed 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://lozipotod.ru/strik?utm_term=who+is+in+girl+interrupted
    • http://best-store.club/pretty_ballerina_ballet_dreams_gamemhehi.pdf
    • http://shopsmmv.site/86384321844ad5y6.pdf
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff2403f8f3c7.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/84951623155.pdf
    • http://wefufivubulal.medianewsonline.com/aporofobia_libro_completo.pdf
    • https://cdn-cms.f-static.net/uploads/4447251/normal_600d34e03f90f.pdf
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ff9500921439.pdf
    • http://leftoutclub.com/hemostasis_in_dentistryxmdwi.pdf
    • http://karaulovlife.site/star_trek_discovery_season_3_episode_6_trailerd65l7.pdf
    • http://pshcomonhere.xyz/wevarupigamuxotunakriskw.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://prostotit.site/refejumefen97vku.pdf
    • http://chatik85939775.fun/shark_navigator_lift_away_pro_how_to_clean9jdyv.pdf
    • http://myfavoritesun.xyz/than_ever_before_meaning_in_hindio2yed.pdf
    • http://rivalo130.com/stihl_hs45_24_hedge_trimmer_reviewix2df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8cc67e06-daa6-4866-a086-af1f235ea5bd/animation_software_for_powerpoint_free_download.pdf
    • http://litorow.myartsonline.com/nidodabovimupusedatoroli.pdf
    • https://uploads.strikinglycdn.com/files/1eb13624-4288-4827-a256-a08c533e1a5a/wodoruseluson.pdf
    • https://uploads.strikinglycdn.com/files/7ced939b-c5b7-4fca-9aa2-066b9e0ab51f/91423372413.pdf
    • https://uploads.strikinglycdn.com/files/93281de2-57fe-482b-a56a-f7db12e7d3a2/national_mall_map_nps.pdf
    • http://jowokepo.atwebpages.com/free_ebook_reader_for_windows_7.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_off0000f764.bin
cb8b1edb77c314249977c6f48b482d8f0a108e58437b0b649dbd967e30d1c1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 5024 bytes
font_01_sfnt_off00010884.bin
43a694a6b46ae12d82c60d1e94b9a58ef04649be376367488f7343b0ce8e8b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10468 bytes

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