Malicious PDF — malware analysis report

Static analysis result for SHA-256 40010303b9b2a3a6…

MALICIOUS

PDF

85.0 KB Created: 2021-04-01 18:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cef1368eb8956e51a16efe9b2fea41f3 SHA-1: a017daba22adc5764a8590591843673038175a31 SHA-256: 40010303b9b2a3a623fe3ff1d62f8fff21b9f0a4b5904df3643ed6fb22f7ed2b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'fokemale.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=what+was+the+purpose+of+the+4+freedoms+speech PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492245/normal_605a1cbebdac4.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/gPeOLi1/dinusevejafavibexunade.pdfIn PDF document text
    • http://xtrading.buzz/how_do_i_scan_from_my_hp_officejet_4630_to_my_computeretwfg.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/is_the_ferrari_f40_the_best_car_every1ygy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_602caf5541927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_6057c8155d8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_603061d390e5b.pdfIn PDF document text
    • http://xikibokukubis.iblogger.org/jasper_weather_report_hourly.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jhijShb/deity_fallen_android.pdfIn PDF document text
    • http://poopo.ru/best_games_for_pc_windows_10_free_downloadyqz8o.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/hfYggY3/wutogurunomamuxenat.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/gImpicE/word_search_pro_answers_garden_essentials.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/i66OPii/50594844234.pdfIn PDF document text
    • http://lupupive.22web.org/41275547834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fe271c1a1b93.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ificihE/green_bay_weather_2_week.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/EiaXLMG/cisco_router_800_series_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1921ae4b-ba08-4bee-a7a5-8b53968d939f/comcast_x1_remote_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3338ee87-26d4-4d0a-a761-4054431257f7/how_to_change_clock_on_windows_10.pdfIn PDF document text
    • http://mapodivopabo.rf.gd/8743938285.pdfIn PDF document text
    • http://motinekan.epizy.com/guputexutumesumewepowi.pdfIn PDF document text
    • http://luxoxuwaf.epizy.com/vujalojoxojowa.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_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 5556 bytes
SHA-256: 14fccfe22272b5c9422d7dc8e4c081be8a33d0cfd689b5d8ed8dccf1bab3347c
font_01_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 11376 bytes
SHA-256: 64bc5f0d0fd089ee6817f9fea975790d3ad7ea046d3d5d6982489126347add3d

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