Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9adebfa1da0e1a…

MALICIOUS

PDF

77.9 KB Created: 2021-04-11 14:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4799460a39f626d51f222b78c934c020 SHA-1: 2b366721107e821fcea5799fc95e10b6c7df6a92 SHA-256: 8d9adebfa1da0e1a615e953720039312e25e8b983c02a13806cda518224b182e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or phishing attempt. The embedded URLs and the heuristic firings indicate that the document is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=what+is+the+theme+of+the+story+peter+pan PDF link annotation
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/237828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_605196391f7a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ffbe56769762.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/47748759370.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/rabikiwifanebefowebon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6027d34cb49af.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/zivulaxapinofi_gawimo_pogarilagope.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/lugolutaliwapafazij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_60235d0daad4e.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/e21b4b32-2adb-493e-a63a-af1ff73920f1/jenn_air_stove_top_replacement_knobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e47f627-96cf-4c94-8194-09cecd56de7d/how_long_to_use_infant_car_seat_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac57e245-4e03-4aef-b257-d2f528d2d104/english_conversation_class_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d47b92-5dc5-4c35-b780-cdbc3a3e481e/zozetujupeforopedagaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5131ee22-4031-4179-bfd8-85e33a6acfc0/rogop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21829b22-4e6b-44ed-8ec1-977292ba3d9f/how_many_pages_does_harry_potter_chamber_of_secrets_have.pdfIn PDF document text
    • http://zibevili.onlinewebshop.net/90650577613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d786aca3-e69e-483b-a435-7b1379d9a922/jvc_kd-r200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e07f74-97bd-40c0-95bf-53255848fc70/fogeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a8a78a-414f-46b2-b515-151797f37616/4234518015.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 5224 bytes
SHA-256: b9ace3338b86885f486b5a14af11256f5cce2241c1be709490fef2ff555f431f
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10996 bytes
SHA-256: a3434f62aef0164d525063770156429a05d441546a7438b0da5ca920b2ed137d