Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11deb3a62b308e9…

MALICIOUS

PDF

73.7 KB Created: 2021-05-19 16:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf0bc82de51af7e3249fccc513255b68 SHA-1: 512b626d99b5a92b12742730ffe7a6bf7cbaefa8 SHA-256: b11deb3a62b308e90e95739a33e538fefb7f145de5fe12f7a74090ab6ed1af58
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 hosting services, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The primary URL, 'https://seumenha.ru/strik?utm_term=ansiedade+2+autocontrole+augusto+cury+pdf+download', appears to be part of this scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=ansiedade+2+autocontrole+augusto+cury+pdf+download PDF link annotation
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/16ada.pdfIn PDF document text
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/xadosodakewavew.pdfIn PDF document text
    • https://wokepugef.weebly.com/uploads/1/3/4/9/134901336/wodozadodevotub_fufapafepujos_kuzarofadu.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/famej_lorogavobil.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/povoxebujilumeviboru.pdfIn PDF document text
    • https://pogedefulelot.weebly.com/uploads/1/3/4/6/134628496/7250736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fcedae7b1bd2.pdfIn PDF document text
    • https://pufizemopuvagup.weebly.com/uploads/1/3/1/4/131407511/kapupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fd0b8dc7c573.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/vunapanifa-xezafubuk-sobelogivanuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_6047bc15ed9d4.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/0fc1ce.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/sebivevusufe.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/47d10c98-bd18-46e3-a159-171053045438/34122505272.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/doruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e52d33-14df-440e-a9f9-a3ed2f0bf71d/42580674323.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/xureraxiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/what_is_joanna_gaines_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c627be3d-79b2-4601-a7bf-1f08fd78fe55/what_is_the_summary_of_the_hunger_games_catching_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c87d7c-4877-4337-9680-615a4b60d76d/nigobumuzelusubalitoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d6183b-1a2c-47eb-8d2c-4727cb114f94/kijolasafona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f61c12-e95c-418a-8954-f022e00e581f/4948767920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae926786-95a2-4421-b7bd-a0a3ecdbddd5/5604972508.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/bully_2_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/video_converter_windows_7.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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 5640 bytes
SHA-256: 2010deb1adfa04ff9bb6754bdd08f00c8a7e0ce38ad21a1a39e70428431ae189
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 12700 bytes
SHA-256: 7b4704b89cb836dd56f02159df8b6b373143586f412b40074d1b27591b73f322