Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89ee86109ab91db…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 11:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73db08629e64d4e12fbf0f23210c2209 SHA-1: 90c3c78517f4873af40d26aaa9433115c15bc5a4 SHA-256: b89ee86109ab91db598405d140060c0f5afdfdbcba814d0e92770acbec4a6a3b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One of the primary URLs extracted is https://jottigo.ru/strik?utm_term=browning+a5+x+serial+number, which is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=browning+a5+x+serial+number
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fe4f65e423b0.pdf
    • https://static.s123-cdn-static.com/uploads/4413570/normal_6005ef401f971.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc61093c32bc.pdf
    • http://tapidiv.medianewsonline.com/banker_s_algorithm_in_os.pdf
    • http://melowimaz.getenjoyment.net/bukawubodedadates.pdf
    • http://trafikcezaodebayisi.com/paxijadokewozupuwt1ss.pdf
    • http://fuxisileza.mywebcommunity.org/sbi_bank_personal_loan_application_form.pdf
    • https://cdn-cms.f-static.net/uploads/4495858/normal_6056115f689a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_d36129a6308c4d0fa89911b4f468e9a6.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_ee53dbb258064943830d1d8678865f11.pdf?index=true
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_2138ac666c7c4fbaa3c7d9133333878a.pdf?index=true
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_9478da5f40db43869dc8113e8ca97941.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e013c5306ce14b1898b9c15b606905e7.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_f15b3e1ceba04adbb68e9a8bb84a1e8e.pdf?index=true
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_460cf76308c04e85b699fa8028c207ea.pdf?index=true
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_53c72368016340f6a19d6d5cb5870af0.pdf?index=true
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_310e72959c3348ef81c1348097e25720.pdf?index=true
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_a8506e020f0641d1bcf8c7c0485c33d7.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_off0000e0e8.bin
61f17629053d5e4140206266ffc0955399e8238e1e25bd90ce9fc082e3d683f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 5280 bytes
font_01_sfnt_off0000f2cf.bin
2045bfd93b28f51913f3293e4a25f11c49b67ca8819ade88ae13b35105540fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10404 bytes
font_02_sfnt_off0001165e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 4324 bytes

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