Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc4e8c5f4279f32…

MALICIOUS

PDF

87.5 KB Created: 2021-03-17 09:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313a317535888a367fb5667177e2179e SHA-1: 7243576fbf22c51d1a06716db1ef18c77cedc244 SHA-256: edc4e8c5f4279f32365b5008ce8c6f1dd0340d62c682829e8dc7ed2b784054bf
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous external links to other PDFs. The presence of a password archive lure heuristic suggests a potential attempt to bypass security controls by encrypting a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/award?keyword=basic+survival+english+pdf+free+download
    • http://persequenteamsohbet.com/nivuvuwatamivoxo4wvt.pdf
    • http://lnstagram-helping.live/ritufamavafodaxukorrbd1.pdf
    • https://cdn.sqhk.co/xurajalijok/whejgUW/talejixovepamabebuxok.pdf
    • https://cdn.sqhk.co/mugolino/ghhicgf/tipepuxuzusupufiwubejex.pdf
    • https://cdn.sqhk.co/dezorevukor/dwpcAYu/lazabujuvujilegijelete.pdf
    • http://alania365.ru/lujobutfkffn.pdf
    • https://cdn.sqhk.co/voxoduvi/bJgjieh/ship_building_tutorial_minecraft.pdf
    • https://cdn.sqhk.co/torazanopuni/3XZgcro/46960811153.pdf
    • https://cdn.sqhk.co/sategexarom/ghejfpZ/4697152867.pdf
    • https://cdn.sqhk.co/bepemuno/DAjcBji/fun_swimming_pool_near_me.pdf
    • http://bufo.online/83484062750psjwi.pdf
    • https://cdn.sqhk.co/ramawuvade/c80ieic/siren_and_alarm_sounds.pdf
    • https://cdn.sqhk.co/wanoposuj/dhCYgh1/mirtazapine_side_effects_libido.pdf
    • https://cdn.sqhk.co/nobipajami/dieC6DP/51934758767.pdf
    • http://salonapp.xyz/book_of_dragons_movie6sdbr.pdf
    • https://cdn.sqhk.co/nejisakatok/r0ibIij/spooky_halloween_sounds_for_kids.pdf
    • https://cdn.sqhk.co/janawezexoj/FQidNi5/recargar_celular_claro_online.pdf
    • http://meblik.su/guxofolirivixeguzoldjqfb.pdf
    • http://pay-order.info/delete_software_distribution_foldervn27r.pdf
    • https://cdn.sqhk.co/ferudati/iihgNzZ/country_life_harvest_day_mod_apk_wendgames.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_da88a47a1b644eec8061f7c287a87ac2.pdf?index=true
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_e483d6c98291498e9e3c95554e25c11a.pdf?index=true
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_c5c037d0474e473a9f11d8cb36c66173.pdf?index=true
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_4e826ac5a85c4da9bd4f238faa2ee109.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d6.bin
3276509fc8d5b4605b440460e854f8524a7988921d5a81014fc24783bf238c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 5620 bytes
font_01_sfnt_off000119fc.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 1800 bytes
font_02_sfnt_off0001228a.bin
e8ddf4e48546e59fe40a11ff89ff9def22f06068c07034b9c41e0600c0c6c612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 14292 bytes

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