Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6985c0bc334cdba…

MALICIOUS

PDF

82.5 KB Created: 2021-04-09 16:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c9b74c4a0313871ba63a2622624d9a3 SHA-1: 2db0285ea72f8bc03cc3ea7d073ac261465d33b3 SHA-256: e6985c0bc334cdbae3175952d1d8d64dc11ba483cc0c00ef06c01a991f5d468a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the classification as a link farm suggest the primary goal is to redirect users to potentially harmful sites.

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://maypoin.ru/strik?utm_term=mutants+and+masterminds+time+powers PDF link annotation
    • http://nikaold.site/steelhead_fishing_michigan_reportgjtk2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5ff91fc167f92.pdfIn PDF document text
    • http://internet-babki.ru/gepalizy7kb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_6027887dbd491.pdfIn PDF document text
    • http://rent-nout.site/gorowayx7ko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_604bc0fbab535.pdfIn PDF document text
    • http://afracheat3.xyz/2018_chevy_colorado_zr2_owners_manual3ujoh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_5fd0eb461002a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467560/normal_604d44504b540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_602da1beb15a6.pdfIn PDF document text
    • http://kilewigi.iblogger.org/tui_ad_yeah_right_template.pdfIn PDF document text
    • http://ukrinsure.com/93170690ra9te.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexasejuwodeji.epizy.com/xaxin.pdfIn PDF document text
    • http://lowavizoviwu.epizy.com/65409716881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1d43f2-ed32-42a9-a03c-4325ec915a9b/the_little_prince_excerpt_by_antoine_de_saint-exupery_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1a84a8-611c-4e19-8453-080d5639095e/how_to_choose_a_scroll_saw.pdfIn PDF document text
    • http://fomuzuzidoduvi.epizy.com/codashop_ml_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401a980d-f5a5-4614-858e-16239b274588/why_is_my_bissell_revolution_not_picking_up_water.pdfIn PDF document text
    • http://birijigasexow.epizy.com/dijiw.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_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 5168 bytes
SHA-256: 83ea20c69308d0924786ee7233464b3ef7e8de207b9b8e71406afcd71130569f
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 11940 bytes
SHA-256: 37ea14810cc70c88a1863e8b640e36a00fcba747bd282af8a0337bbc8b5d3caa

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