Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23f386ddae501b5…

MALICIOUS

PDF

83.8 KB Created: 2021-05-13 02:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d43a7a74114b3e27486987cc8537bb SHA-1: 231bc10b5be1ceea41f0505610787618215bb132 SHA-256: d23f386ddae501b5b7ae678abde9a507193e5b3103205a675ee39f5ef4f0bae3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm intended to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-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://kuzutuzo.ru/strik?utm_term=remington+870+super+mag+camo+20+gauge
    • https://lapimirisa.weebly.com/uploads/1/3/4/3/134372347/1348009.pdf
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/juguxej_mikelotezoro.pdf
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/bazisadumiwedobixos.pdf
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/797910.pdf
    • http://usechambre.xyz/you_before_me_full_movie_with_english_subtitleszar0j.pdf
    • http://copyright-securityx.com/matching_uppercase_and_lowercase_letters_worksheetawqyc.pdf
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/184962.pdf
    • http://itash.space/oldies_music_station_seattlekmqcf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_65919b8487e746cba588281e121f4beb.pdf?index=true
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_d890b7f64a2041d5b3b9a4592bb2eb1d.pdf?index=true
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_7a8b10b76e3d4368ad09a6b8d6e4bec0.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_5f2e5088377b4e6bab7b8b94a9aed18e.pdf?index=true
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_2bbc4ec170314eadaa62ad45841a878b.pdf?index=true
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_0f6adbdf604f489bb16e10a03b2a5561.pdf?index=true
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_3e3ace3bd82843e7b4e5d56b3da5ba20.pdf?index=true
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_052f68a72d464ce19ac01bdc39706c8a.pdf?index=true
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_8bc0f9aa82454a1099a638d9c76510fc.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_e84cf62aba6d4a3b9d8a004b368ff7e0.pdf?index=true
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_e7ae0a5c7fe44bdea42161bdeaa6b990.pdf?index=true
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_cb8b97c97ef441c0af0f51938bf29474.pdf?index=true
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_75385fc2c0394522b8fc28eed5a653d8.pdf?index=true
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_dce4f4b0fa174b8ab026b4aef690abfe.pdf?index=true
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_f1205cc4a4dc4dc6ab61233a4ea61209.pdf?index=true
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_b4c6238367d941bb9eda426a1c8824c3.pdf?index=true
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_d73057f08d2e4d5f94db555e076d3941.pdf?index=true
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_08536164886a4abca5129a7761c99449.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_b1e1cf6ebace4c8891f2bd7c0b65bb73.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_off00010881.bin
56d5151503e96cf27ee413b8e15b14cc1cef28baca753454e7813596cc5a9389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 5776 bytes
font_01_sfnt_off00011c1e.bin
c6d135ae43373d1d9c43f26c0c3146c2afff0d3b52f4c52f6133eb97e6ab0bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 10932 bytes

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