Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bfc51bc2fdc218…

MALICIOUS

PDF

77.8 KB Created: 2021-02-11 14:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67bf834c72a1e9eb0682c6efe61509ea SHA-1: ffe1bea0df9448d14549c100b9106770979dfb22 SHA-256: a6bfc51bc2fdc21868481010c104294995819ef624593dbd75223886ecf217e7
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary function appears to be directing users to external content, likely for SEO manipulation or to serve as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wb?keyword=apogee%20duet%202%20driver%20mac In PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jAhe1hd/christian_church_songs_offline_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/iihbAgs/prison_break_season_6_episodes_download.pdfIn PDF document text
    • http://naturfresh.fun/computer_launcher_pro_apk7pkwm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_600f750f649a7.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/996a4ba7.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/nY5ghie/forward_assault_remix_download.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/jomiz-zexitumifos-sesad-piniguzez.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/jnifghU/download_permainan_monkey_boxing_mod_apk.pdfIn PDF document text
    • http://nesobaka7.xyz/university_physics_volume_2_answersl2yxf.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/8159795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_6000c186e1c2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5ffade4f22b33.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/gehjV5f/dodesobodutavuxinoriw.pdfIn PDF document text
    • http://qwertyujg.xyz/savowilukajusixagobe4eo3j.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/b20e6.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/figidireki/amma_endrazhaikkaatha_tamil_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/idsa_2015_endocarditis_guidelines.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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 5364 bytes
SHA-256: 4dee9a3a8952e3a65d278ad7fa71386193d35aa8dc548d75defccfffbfaf3723
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 11352 bytes
SHA-256: a9fd97f2c49288b7f6a6039d2b8faaf02ea656efaa14d10425e9635aef7f9ab5

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