Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f922ad4e06e445a…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 05:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6324411229fee8367fb6fddfe9de627f SHA-1: 02cf27e8e8d0fb6e27013134aac2dd3fe3e7f644 SHA-256: 1f922ad4e06e445acf74865dc6167e4ca4df25cde2b04e09eb462e84bd73b80d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'symbols of the 12 apostles' and 'wkhtmltopdf', suggesting a lure to a malicious site disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pelibifir.ru/strik?utm_term=what+are+the+symbols+of+the+12+apostles PDF link annotation
    • https://cdn.sqhk.co/nelufebo/a5hiNdB/68724425545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_6017095cd6e5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5ff1615d87a9a.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/faf3883f.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/b8cb0c9.pdfIn PDF document text
    • https://cdn.sqhk.co/zesojesiwi/d9gcgvv/bike_racing_game_download_apk_10_mb.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/57309182852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_60125abb1c2e8.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/terikirozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fe745b6b563c.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/bitoruramilegiditubo.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/hjfmRUa/pesoziwikejigijumukidi.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/4038066509.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/Eggiaic/tafupe.pdfIn PDF document text
    • https://cdn.sqhk.co/kubemuzu/NhdyCP5/tor_browser_32_bit_filehippo.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/ansys_apdl_tutorial_for_composite_materials.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/sarezosamukida-besol-rupagedesu.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/edgar_allan_poe_cuentos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_602972203cc14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roporuti.onlinewebshop.net/an_introduction_to_the_history_of_psychology_6th_edition.pdfIn 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 5580 bytes
SHA-256: 67959029f7995901d13304b0c2e1c1b6a25c7799737fe072c0cc385717318e3b
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10792 bytes
SHA-256: 4498d10a55b8aae6688dd57a8255a7f2a8dc0f65b5c3cf26ab7f39716297c2f0

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