Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38a02c83ab775fa…

MALICIOUS

PDF

86.7 KB Created: 2021-02-16 16:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5e3853623db9baefbca337194bd82944 SHA-1: e7277a0c0b14faefbfa6b6d495cb3fc9ae4cbac7 SHA-256: a38a02c83ab775fa425eede2cf40de38707723aa0960f301bb66185f28e87b0d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting, strongly suggesting a malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+does+facilitator+mean+in+2k In PDF document text
    • http://geesecam.com/27676392823vvvcq.pdfIn PDF document text
    • http://parhelifrl.space/community_helpers_worksheet_kindergartenzmhnm.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/E6JoUha/talking_thomas_and_friends_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jbid49w/3d_city_driving_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Sohhrgf/goldlink_crew_remix_lyrics.pdfIn PDF document text
    • http://bluebadgeapproval.com/dubelofurusaboldo39x.pdfIn PDF document text
    • http://voirly.xyz/galibijerijadewilovwmuuj.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/GUIghxd/nerirazonoturukotu.pdfIn PDF document text
    • http://educationonline.website/direito_processual_civil_pedro_lenzarpos1.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/aSAVO6U/73969301898.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/chhattisgarhi_gana_full_dj_song1vz1h.pdfIn PDF document text
    • https://cdn.sqhk.co/xivudebisov/hfgdghQ/zombie_killer_survival_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/jjghjeV/shadow_fight_2_special_edition_apk_download_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/47251006957.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/esprit_de_l_athisme.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/addicted_full_movie_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/900656726.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kegagulixevisufi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/75559695846.pdfIn 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_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 5468 bytes
SHA-256: 06b773154310a618c3cfa5326780195f9116e3640dcc82994b7fbc81531c499d
font_01_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 11584 bytes
SHA-256: 4a62c2e34910aa4b5cec94669087675cc45d09d7827c92283767bc21bc9fefd5

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