Malicious PDF — malware analysis report

Static analysis result for SHA-256 319e8007ceac9133…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 00:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 17c8e906c19bcc73124c1a6c02d93b0d SHA-1: 8695f6a65edec927246c6b0faa95a06655f1ba84 SHA-256: 319e8007ceac9133152f258b6b531f7085cc4ab9c1c25d163546746c1e5b8f2b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://crophysi.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+daniel+prayer+book+pdf In PDF document text
    • http://lewuvumo.sportsontheweb.net/56226352004.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/completing_the_square_exercises.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/peer_gynt_in_the_hall_of_the_mountain_king_lyrics.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/robige.pdfIn PDF document text
    • http://voxemukam.22web.org/99571261349.pdfIn PDF document text
    • http://retoxen.mypressonline.com/90371630157.pdfIn PDF document text
    • http://dexiwakuxabef.medianewsonline.com/82955783096.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/converting_grams_to_kilograms_worksheet.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/mijutuxaser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_71bdb063831949f294e962ea1a655f70.pdf?index=trueIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_1d0e94adfa8c4c27b7926c1c89fc57bc.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/journal_el_khabar_2020.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/84324934150.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_45f00b278b5d417ba2cf9117e6a1aad1.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_a3a8eba347ac4dbda05cfdfd45253529.pdf?index=trueIn PDF document text
    • http://lojogonofar.rf.gd/how_to_replace_samsung_s9_plus_battery.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/xokijemejoregubolitoruped.pdfIn PDF document text
    • http://sidiwen.epizy.com/pagotozebowonaguw.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_670d2e47b7b14ebd950c5ae619e950fa.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_9f704652f9274f0f89f56ac977be0436.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_3a4bc1e7ff6f4e90b27f2d631145c6c9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 5208 bytes
SHA-256: f2e3cd4707d64d6d990c7414d68aebfa4067b4feeb5c7557e9c837a658c12f6c
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10952 bytes
SHA-256: 9334a91cebf069291b33085697e383bcadde78cf31ecfd92db7df0fe7492807d