Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa743be16b7e3ec…

MALICIOUS

PDF

71.7 KB Created: 2021-06-11 13:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 92eb711053c0b1cf05e1e8e0c55bf3d7 SHA-1: 6a3cf25be58c3fdcbba752d16bf6ffb7851e08cb SHA-256: dfa743be16b7e3ec9e695abc3d225d3eb94c07ef6425e7667295abeaa091f37e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is a potential phishing or malware distribution point. The presence of multiple external links and the ML classification strongly suggest this document is part of a phishing or malware delivery campaign.

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://inwebjor.ru/pbw?utm_term=vennello+aadapilla+pdf+free+download PDF link annotation
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/rugigudoziw.pdfIn PDF document text
    • https://vutadatibanol.weebly.com/uploads/1/3/4/8/134883393/votijifatezipif.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/wonod.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/nosimigo.pdfIn PDF document text
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/a90f7cc7a35afc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bawamotijeku.pbworks.com/f/vakanuvelovubunoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7c55e1-e034-4a92-9249-3271a92ca30d/magivulezeripurizuzevufu.pdfIn PDF document text
    • http://tezalef.pbworks.com/w/file/fetch/144848628/how_much_do_freelance_graphic_designers_charge_uk.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/w/file/fetch/144616035/sasisotevi.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144473664/how_do_i_sign_into_my_amazon_account_on_my_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c385481e-9a9f-4d66-983a-d4f9abe47e45/juxidedirovetupegon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4638db-ac83-45ed-a697-f2573ee4c6c5/microsoft_project_online_professional_cost.pdfIn PDF document text
    • http://gawalutibig.pbworks.com/w/file/fetch/144904998/91878665234.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144560379/nuwenizirigenanixiluzak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d56ee25-ade7-4775-84ea-9f1588892004/dd-wrt.v24_mini_generic.bin_download.pdfIn PDF document text
    • http://berilizi.pbworks.com/f/13365152018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f15f64-5620-4e44-9386-8643b6408dc0/pioneer_avh_p4200dvd_firmware_update.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144438072/internet_of_things_a_hands-on_approach_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e11c88f-3af8-41c9-bab9-23d75439a356/basic_english_grammar_exercises_download.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144592068/43940565756.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 4912 bytes
SHA-256: 982e5b8bda09ae9e37ca68bf559a62ff6011a90a018eef1941cb095b80198ee8
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10516 bytes
SHA-256: 2f968ff80f9354ed0cf88485a61cf5e745e4cd2f8c1c13a14deee7b03c6e24bf