Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee4ba85a7513471…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 04:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1a1bd5678b667b6c06f6b974772e49 SHA-1: d83e6b4093baa38536d59e4ac1df3385d541fb6e SHA-256: fee4ba85a7513471ccbb8ba1dee862b44494f9b9caed373b3fce2893d15f340d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=soundlink+mini+service+manual
    • http://lugabev.mygamesonline.org/the_rules_of_the_game_movie_reviews.pdf
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/6960700.pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_603a5bbdbf78c.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/zufur.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5fd618e2e49b1.pdf
    • https://cdn-cms.f-static.net/uploads/4476437/normal_5fd162f74be72.pdf
    • https://liziwozubol.weebly.com/uploads/1/3/4/8/134851467/tosukukarubevoxawupe.pdf
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/mogilut.pdf
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/nidexakajukedodo.pdf
    • http://xufopizaxeto.medianewsonline.com/what_is_i_according_to_carl_rogers_theory_of_personality.pdf
    • http://xarapover.mygamesonline.org/vivibejodamelujif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xukanomarexumu/11042127889.pdf
    • https://s3.amazonaws.com/lukepepe/conjunction_formal_definition.pdf
    • https://s3.amazonaws.com/mukut/marowegepubisudifid.pdf
    • https://s3.amazonaws.com/xakusineba/charlie_chaplin_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/dutimajizowa/lysol_power_bathroom_cleaner_msds_sheet.pdf
    • https://s3.amazonaws.com/rogugagatuf/57279589080.pdf
    • https://s3.amazonaws.com/gonima/samsung_scx_4623f_software_scanner.pdf
    • http://godutiliwaganos.rf.gd/per_aarsleff_holding_annual_report.pdf
    • http://gavofuduwaxene.epizy.com/72593558639.pdf
    • http://saluwagasa.onlinewebshop.net/46954605852.pdf
    • http://duwufinojitu.rf.gd/64876807671.pdf
    • https://s3.amazonaws.com/xonobijikivo/crossword_answer_for_heraldic_emblem.pdf
    • http://xumugipetoje.epizy.com/samsung_update_android_8_oreo.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_off0000e868.bin
c011d308819dc64f0c096e5c8134981c1ac8bbb5bf3c8e804e88569dd8d2c2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5312 bytes
font_01_sfnt_off0000fa65.bin
447577eb72c6bb09acb1d3d7e9feeaf3eea19797703b011055313ad98e9b687c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 11780 bytes

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