Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0f8544700139f0…

MALICIOUS

PDF

70.8 KB Created: 2020-12-17 08:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 450ad2d2011d743059f4c9db54edf248 SHA-1: 1891aabbbe98d6a544f93b33acb6a40594cf9dd2 SHA-256: cd0f8544700139f0d56783fc3a28e157d012a8f8f719e97e36cc66903978cbd4
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=base+attack+bonus+5e
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdf
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/8947699.pdf
    • https://kaxutaxi.weebly.com/uploads/1/3/4/3/134387751/827afe7d7bdbb.pdf
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f9ea7dfc02e0.pdf
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/tirolegijukisuwurob.pdf
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5f95bf02170b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0454977f-649b-40b2-95fa-6d1a7ab55a07/flexor_tendon_power_legs_reviews.pdf
    • https://s3.amazonaws.com/buganabowumujef/calendario_menstrual_2018.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfbe479c08c7f2b9ee89c/1606220773439/oconee_county_jail_inmate_search.pdf
    • https://static1.squarespace.com/static/5fc12f0cbe9b6939510c9a47/t/5fccee2f6f0099009e64826f/1607265840349/fnaf_vr_help_wanted_showtime_song_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/17d5c4fc-9dfe-4573-a761-ef526f18fc40/14486229326.pdf
    • https://uploads.strikinglycdn.com/files/9989644a-6549-420f-8c2a-1d179631f5c6/avondale_middle_school.pdf
    • https://uploads.strikinglycdn.com/files/837fa461-ba85-46c4-809a-6342acbd41b6/jason_nash_is_married_imdb.pdf
    • https://s3.amazonaws.com/henghuili-files/apresentao_comercial_design.pdf
    • https://uploads.strikinglycdn.com/files/f7d739db-4712-436f-bc24-1daa08c59d4d/vca-dcv_official_cert_guide_free_download.pdf
    • 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_off0000d8fc.bin
7dfc452b0ffb3df57d0873c20b9bb847fd99409adf420537e02bcd2a6a1e6290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 5044 bytes
font_01_sfnt_off0000ea40.bin
cc7d7d73d62fe107fd39dcc07e2f103640484bc6ed4dffdf7b469f557abdd48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10668 bytes

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