Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c4ddb6c31ef0d5…

MALICIOUS

PDF

86.7 KB Created: 2021-03-14 09:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb851087446ce9f63322940563f0568 SHA-1: b31c855e3f7b8d839e67d649a4e3b8f75a1de2fa SHA-256: 32c4ddb6c31ef0d52d94a1e450183bca11e50a1201867426401038f5bbc3f8f5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or spam campaign. The document body, though heavily obfuscated, contains metadata related to 'Nerf rival manual' and the wkhtmltopdf application, likely a lure to disguise the malicious intent of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/wix?keyword=nerf+rival+manual
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fc811aea60c0.pdf
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/goxoragi.pdf
    • http://kvyovk.xyz/243498645559equz.pdf
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/xovodax.pdf
    • https://cdn-cms.f-static.net/uploads/4404964/normal_601ef80b097e1.pdf
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/ruxado-galit-bupaderuwalit-nidipewed.pdf
    • http://fupefabesosada.mygamesonline.org/bullous_pemphigoid_treatment.pdf
    • http://jushq.pro/34391162345cafop.pdf
    • http://meetchambre.xyz/guitar_easy_chords_for_beginners_songsyh40x.pdf
    • http://iminn.ru/2000_mercury_150_efi_fuel_filterodxvl.pdf
    • http://taher-tcac.com/ford_mustang_gt350r_top_speed7x5eu.pdf
    • http://studyweb.site/the_legend_of_zelda_links_awakening_dx_rom_gb_espaolx9xya.pdf
    • http://autocredit.moscow/mewopopajamatomikezewopoly0sc.pdf
    • http://toolsbestpricemicrometer.site/centos_6._5_iso_64_bitslb9w6.pdf
    • http://telgrm.site/concept_sheet_architecture_pinterestj3luw.pdf
    • http://sewukagazub.mypressonline.com/gubabuzut.pdf
    • http://pepariravifaza.getenjoyment.net/gre_revised_general_test_score_range.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lifobem.myartsonline.com/86921211332.pdf
    • http://tigagatu.atwebpages.com/54902746195.pdf
    • http://keregimuw.onlinewebshop.net/fisavilal.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_off00011b1d.bin
0752892cb7f13ea9a3e5777cae015779ceecd2984772d5bf1f9428dba2d76d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 4764 bytes
font_01_sfnt_off00012b47.bin
8c9f7608ab8c457dd835636d67e50edb7b616d5b05409b03ce9f00f5aa583b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 10228 bytes

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