Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f88cb52bbc35d8…

MALICIOUS

PDF

73.7 KB Created: 2021-02-13 14:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c87c951fb431ac35692bddd9e4fd22bc SHA-1: e2ac2b2ecc7159b630499f0238a58e32a05b9f50 SHA-256: b9f88cb52bbc35d840a040345039aa7648f59a5d80353dc363e62996a1a861d0
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links indicative of a link farm. The ML classifier also strongly flagged this sample. While no scripts were extracted, the embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/123?utm_term=evod+vape+pen+settings In PDF document text
    • https://cdn.sqhk.co/sazobenapur/jigjh3B/how_to_get_the_cw_app_on_roku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_6009664552682.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/gi1L2tv/74068565600.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/2141252.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/jjvL1ha/biggie_pac_beef.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ijjcuBs/guide_tips_for_maneater_shark_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wojomisew/jhX9Rij/soccer_skills_videos_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/iaiaTyh/blue_ice_wolf_theme_apk.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/fanobapamifa_betafagin_zadetud.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/cz909ja/mad_bullets_cowboy_shooter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/Uhegija/xazafobuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/fy8FhaK/run_race_3d_online_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/gjpid29/edpuzzle_login_with_clever.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/7ba2f9c34.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/fezenur/asos_semi_formal_dresses.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5016 bytes
SHA-256: 47537845f4f4bed59f2805d31c7b8df0b5bb3f33ca4ad22a610c26c2a8afb8ff
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 10764 bytes
SHA-256: f21f59c4a41c7e8b0faad3ec39000d40fca02e8675271c85030a60aba77b2f56

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