Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3f73dc17aa1894…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 08:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d907b86ceda1004b2e7002651ea81d45 SHA-1: 2776ab58a14857f89b4eda6ed11abdab7a4d2705 SHA-256: fd3f73dc17aa1894edf138ea5ffbd7397106013ddd6e4984dcdee2000731b644
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with one of the initial URLs being https://xezojetit.ru/strik. This suggests the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=washington+state+football+coaching+staff+2018
    • http://nupewijanetari.medianewsonline.com/wijujidadax.pdf
    • http://pemotutafid.mywebcommunity.org/personal_care_assistant_job_description.pdf
    • https://cdn.sqhk.co/xivovido/Lpe4jaQ/best_friends_forever_quotes_in_telugu_download.pdf
    • https://cdn.sqhk.co/lajefage/xy6CSha/regige.pdf
    • https://cdn.sqhk.co/lewenowaxer/SXicuc2/minecraft_java_edition_price_microsoft_store.pdf
    • http://worozoxiw.sportsontheweb.net/textaufgaben_bruchrechnung_aufgaben.pdf
    • http://xemuzaxu.22web.org/vazuvozum.pdf
    • https://cdn.sqhk.co/jobubexivex/hcpgghh/57063276446.pdf
    • http://migasoloraluxuj.scienceontheweb.net/vibowanudabexebin.pdf
    • https://cdn.sqhk.co/todiwapubu/jjfXOhg/fishing_guides_near_medford_oregon.pdf
    • http://lizowaw.scienceontheweb.net/how_many_sentences_is_a_brief_paragraph.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_903039f85d874073b5cb9749d2f0ba47.pdf?index=true
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_cd38cca5f3c74e599c75a012cbb347c0.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_ce719177d5274a94ba7d78854e59d06d.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_03fd76ce3fee4498ab0ba2c9a6262e09.pdf?index=true
    • http://rurebafib.onlinewebshop.net/celestial_tarot_book.pdf
    • http://meluxowuxepos.rf.gd/76612276929.pdf
    • http://xuwanozofugis.epizy.com/85222035438.pdf
    • http://girogabunuxumu.rf.gd/aur_ahista_kijiye_baatein_ming.pdf
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_cd5ccc2cd0c4445aa453adaa3c229349.pdf?index=true
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_8500c0d86c9f4678b071913595170a25.pdf?index=true
    • http://mekasesajiw.onlinewebshop.net/tabel_nutrisi_hidroponik.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_900dd0039d81438bac12b421c659d5b0.pdf?index=true
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_aad81c28b487402baf9fae87df2ac799.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_off0000f14c.bin
c6fdf8141479dda271d63784e398021d9286060e782faa01c334f747a3696555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5720 bytes
font_01_sfnt_off000104df.bin
b716acdc632256d9d6bf0de6fd3ee20242193fb7a1cef059c0cb5b680a06a3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10932 bytes

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