Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18ad362e654f604…

MALICIOUS

PDF

89.7 KB Created: 2021-04-01 17:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec2d9e2959f1473e9bdc220797d3d8e9 SHA-1: 1084014a1653eca1acff240144de5e995ff14cbc SHA-256: e18ad362e654f6041dd4a32c1ae8d317622f22f3348ab8476f51635757c49037
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to appear as legitimate content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=collapse+of+the+republic+pdf
    • https://cdn.sqhk.co/kibedutej/4gcibyx/2875079796.pdf
    • https://cdn.sqhk.co/goxobuve/ie1Wp1F/stickman_fighter_epic_battle_2_download.pdf
    • https://cdn.sqhk.co/vavusiwi/phciegd/stickman_fighter_dragon_ball.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6050410619f81.pdf
    • https://cdn.sqhk.co/nujamaweke/TjaJxfy/word_search_free_printable_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd611bb5de4b.pdf
    • http://ibkreactiva2020.com/officejet_pro_8600_plus_drivert3siw.pdf
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5fe17a62826e9.pdf
    • http://adminhalil.com/the_wolf_hunterz_band_wikipediayklwh.pdf
    • https://cdn-cms.f-static.net/uploads/4370055/normal_6061e7dcc8eab.pdf
    • https://static.s123-cdn-static.com/uploads/4414353/normal_600747d849337.pdf
    • https://cdn.sqhk.co/fowipovoji/iiih3ih/94030571409.pdf
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5fcda93ee8d0c.pdf
    • http://oyuncuxx.com/resident_evil_2_strategy_guide_downloadz2wfe.pdf
    • https://cdn-cms.f-static.net/uploads/4486758/normal_6046ff6d1fb0c.pdf
    • https://cdn-cms.f-static.net/uploads/4458125/normal_600bd3150ec75.pdf
    • http://idealslimitalia-ufficiale.site/27111989453qc731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f2eb635-23cd-4990-a2c7-8d389fc81bbd/bawiligejelaxas.pdf
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_0e0cc139371446d0ad53e655f1b82ba9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65401f31-a48c-435b-b5e4-e0e029c3d311/65268572117.pdf
    • https://uploads.strikinglycdn.com/files/3c7330a8-d566-4bb3-8ef2-cb98485c2f3b/how_am_i_supposed_to_renew_my_license_during_covid_19.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_45e3b1684dc949acb176c660e5d3d787.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a176769a-6e21-4c77-9685-540b4185287a/stairway_to_heaven_chords_uke.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_off00012156.bin
18b9010c9d62cd58f50d31c4b0068860dcc7a3e74635fa0c75d1b4228e62ce9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 5288 bytes
font_01_sfnt_off00013340.bin
be8f3a5a64b3ad3eb7ff6bd8cbbf286fae6d45a790a001727c01dfc4e719263e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13340 10856 bytes

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