Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe227cc1a5b643e…

MALICIOUS

PDF

80.2 KB Created: 2021-03-10 05:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 17d3b84e3eccd27b6dd656d33e7574ae SHA-1: e5280386c130e393f33e79303eed8bed1149c1bc SHA-256: 0fe227cc1a5b643efda1c368c6241cded66cb74ffdb4e554d9ece2ae5b0104d6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://lozipotod.ru/strik?utm_term=suzuki+cello+school+book+1+pdf, which is likely used to host a secondary payload or phishing page. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://lozipotod.ru/strik?utm_term=suzuki+cello+school+book+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413362/normal_6040a6c7b35d5.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/fc9a0f1c64.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/gfqibhc/mawewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fd8d1fc32812.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/what_kind_of_oil_does_a_briggs_and_stratton_pressure_washer_use.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/idijagd/1138039160.pdfIn PDF document text
    • https://sobafezusebe.weebly.com/uploads/1/3/5/3/135335887/2978818.pdfIn PDF document text
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/7514748.pdfIn PDF document text
    • http://rajajime.mypressonline.com/what_do_i_wear_with_navy_pants.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/iaDiahc/greatest_war_strategies_of_all_time.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/95ea5bb.pdfIn PDF document text
    • https://televonifu.weebly.com/uploads/1/3/0/9/130969274/0405ab17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_6032c4083adf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fd8201d1cdca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fe53d82a735d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77745bf1-a736-4e02-83b0-62bfcf5055b6/dejiwikoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baaa42b-cbee-4852-9e57-2280d219912d/how_to_reset_whirlpool_dishwasher_heating_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6714ac64-2bf5-4300-81e8-94f0e9dd14c7/how_great_thou_art_printable_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a81c20-c98e-4319-bcae-76db1d46c65f/62629465015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd862ec-0961-4f76-afd2-1e84b406dca2/tadatadejufa.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/is_nikon_d5100_a_good_camera_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f553b869-db09-4775-9458-de02ddd899a7/29069181883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccd2cd8-f568-42f6-889e-88bc053fe969/39529814419.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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 5344 bytes
SHA-256: cef5ac844b260459ef64b3923edb4738ab77a789dc297292f7e54fc17a5894af
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 11552 bytes
SHA-256: b259aa97958bf808aa0d8fe03596a71bb40899d747a06653dbf24fb24b1fb322