Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a306ee5c15552e1…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 15:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7c9c89d1c7757404d5657064c98351a3 SHA-1: cd58fe6b56af2c83c537b5eae08cb6e915436040 SHA-256: 3a306ee5c15552e1ef26c21f08b91cbf3474352db58c4ded9003fd5a983e8c52
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/123?utm_term=state+first+law+of+thermodynamics+pdf PDF link annotation
    • https://kagafalevusina.weebly.com/uploads/1/3/4/3/134368330/gonemuv.pdfIn PDF document text
    • http://ergors.space/ropaxavogabocfls.pdfIn PDF document text
    • https://cdn.sqhk.co/juviwonu/tjguiap/business_games_online_at_agame.pdfIn PDF document text
    • https://nenonafadigis.weebly.com/uploads/1/3/4/8/134856929/madavubiri.pdfIn PDF document text
    • http://housefashion.ru/83062355904pazkc.pdfIn PDF document text
    • http://usacreditmonitoring.info/comptia_project_study_guide_free_downloadex5tl.pdfIn PDF document text
    • http://job-finder.space/what_language_does_the_mandalorian_speakvqapm.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/4585185.pdfIn PDF document text
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/2373fccafdc3c.pdfIn PDF document text
    • http://bloodcraft.online/grease_song_hopelessly_devoted_to_you_lyricshu1hw.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hbkggia/top_wilderness_survival_shows.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/5gWxNha/zetogizimufezoruxutu.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/aidygdG/buxizopamonokab.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/fufasonevexaxeba.pdfIn PDF document text
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/nunuwif_wenoxexa_padagejate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/88a5fa8d-1670-4efa-9758-c80fe04ab9e3/jigagokajamafewotolomex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f340ccf-bc09-4398-8103-523cd1011689/socratic_logic_peter_kreeft_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6bca81-f4b4-4852-9e1c-0b1b6207ac4a/fitawimodimileronuketi.pdfIn PDF document text
    • http://zapesuxeliribi.rf.gd/macrumors_buyer_s_guide_apple_watch.pdfIn PDF document text
    • http://zetamox.epizy.com/fopezuxokasurerevixatejos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beeda4e3-a38d-463a-a339-18bf038f2b70/can_you_get_imovie_on_iphone_6s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397ee18b-07aa-4e83-a32b-cb047b2d2144/66273085880.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 5480 bytes
SHA-256: deb98244273f057f4f52298a4624c3aa4812f4a646dc1736fc592c1dbcc189de
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 10324 bytes
SHA-256: 1bb13cb12a5d9d8488e75a2f270262967eb5a9d7e97141879719ea719111e67d
font_02_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378