Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2b863fe5d0c8da…

MALICIOUS

PDF

86.7 KB Created: 2021-05-15 22:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff42ab2e7577fe77f8b93bbfb3794a8f SHA-1: 73f6f577dbd8c78897b851ba3806b26b89046626 SHA-256: fe2b863fe5d0c8dad9ea5c7b77042cf1a707ae0b7b937b7ebc93bf347fccc037
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV detection and ML classification strongly indicate maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=stihl+fs90+trimmer+parts+diagram
    • https://cdn.sqhk.co/guwuweri/hjaSgeR/thames_and_kosmos_gumball_machine_maker_canada.pdf
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/3702710.pdf
    • https://cdn-cms.f-static.net/uploads/4413468/normal_60622a532127d.pdf
    • http://posebakuxosafod.getenjoyment.net/types_of_cost_allocation_methods.pdf
    • https://cdn.sqhk.co/wasulevilid/glrgcsY/78852495261.pdf
    • https://cdn.sqhk.co/radojiga/glDSVfr/96368157768.pdf
    • https://cdn.sqhk.co/pisomuma/jdidhhC/communism_vs_fascism_venn_diagram.pdf
    • https://cdn.sqhk.co/gowamojon/gCkhcqR/kozixedufojufa.pdf
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/wojuxo-sopow-vopukol.pdf
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/bevuj.pdf
    • https://cdn.sqhk.co/tovasodoj/igdOjca/58412478526.pdf
    • http://kaxavetaxudu.mywebcommunity.org/dd15_2_fuel_filter_system_diagram.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/19084bb9.pdf
    • http://vegofejolafud.mygamesonline.org/65516249922.pdf
    • https://cdn.sqhk.co/sukonazukuv/hc1jhiD/90s_music_pop_music_hits.pdf
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/punalaxefifeke-gulixakikituvov-jenibamubefa.pdf
    • https://cdn-cms.f-static.net/uploads/4472503/normal_602fd30083c01.pdf
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600f4f00912e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bipegokatif.onlinewebshop.net/9th_grade_chemistry_test.pdf
    • http://vegunag.rf.gd/battle_trip_wanna_one_subtitle_indonesia.pdf
    • http://xowuzafojizoma.epizy.com/95537481660.pdf
    • http://pikelimo.rf.gd/why_keurig_2.0_wont_brew.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_off0001108b.bin
8585b4b2cecc33e92d06f355c5be55b665db7872cbb893d6d7eb20db654d629b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 5856 bytes
font_01_sfnt_off0001244e.bin
a52013e2db0c1c2ff1e4148a1ea96289954cfb57de8487b2625910bf5c2c9f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 12764 bytes

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