Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c859d5123aba44…

MALICIOUS

PDF

65.2 KB Created: 2021-04-01 18:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5135164628a832a8e3c0d6b8c2db6e99 SHA-1: da8b02a774d7dc6706aeee606bb40f287c0304c1 SHA-256: 15c859d5123aba44c434e651174d7279843553b2b83a6af8935f939b778782e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary URL, https://jumiwimov.ru/wix?keyword=literal+vs+figurative+language+worksheet, is likely part of the lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=literal+vs+figurative+language+worksheet
    • https://cdn.sqhk.co/todiwapubu/3hi4Ghe/candy_shooter_bubble_pop_2020.pdf
    • https://cdn.sqhk.co/fodexuxefeba/4jfQQHA/bosses_anime_fighting_simulator_codes_wiki_2020.pdf
    • http://blockingscenery.com/noad_solo_guitar_playinglev9e.pdf
    • https://cdn.sqhk.co/mobirewin/rdEHieK/rolivuro.pdf
    • http://avtoshtorki.shop/fugewepec8y6j.pdf
    • https://cdn.sqhk.co/pajokiman/gehhGhd/this_means_war_movie_soundtrack.pdf
    • https://cdn-cms.f-static.net/uploads/4388177/normal_605633b7b351c.pdf
    • https://cdn.sqhk.co/garoresolif/hjgmn0E/84591196015.pdf
    • http://fabunek.iblogger.org/what_does_6_months_of_dating_mean.pdf
    • http://natural-shop.info/lg_dryer_wont_start_just_clicksg0dk2.pdf
    • https://static.s123-cdn-static.com/uploads/4469126/normal_5ff2c7a79b625.pdf
    • http://useraisins.pro/70761909073nnouf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_e6a29c11c9b348a1ae4c34d27b9b79b4.pdf?index=true
    • http://dosatetirudipu.epizy.com/xijafuzapagotawetu.pdf
    • http://fekuzigide.epizy.com/academic_information_meaning_in_tamil.pdf
    • http://nifibomagogov.rf.gd/blackness_primary_school_uniform.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ba961e97f6a54f78b5c101824f598e75.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_8fd8b21a1e3243fca68c81b9f190a341.pdf?index=true
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_d4fff130755a48d38bff493b51dc4a4f.pdf?index=true
    • 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_off0000c3bf.bin
9ffd9622c44c4a6adc02c7a5d9a96958b07802260ad592d3618cc6ed7e5de745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 5188 bytes
font_01_sfnt_off0000d57a.bin
7f73c2dbdc5a0efad231b707b7e59739915fe640028601da7c838a438fc4b7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 9984 bytes

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