Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07f3d54fc62394d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-25 17:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 403ca5b42924c8fe241f482f6bdff23d SHA-1: 3628a6dc8bb828ce0319ea105ffb9fcfbdd56bea SHA-256: a07f3d54fc62394d01146faedeefa096561fec26b7edc45de568650a938576a7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or phishing. The embedded URLs, such as https://ponafet.ru/award?keyword=microsoft+excel+2020+advanced+formulas+and+functions+pdf, are likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=microsoft+excel+2020+advanced+formulas+and+functions+pdf PDF link annotation
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/nupapud.pdfIn PDF document text
    • https://misurenagikokiz.weebly.com/uploads/1/3/5/3/135332419/00df5d9edf352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_6023c8315a924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5ff762786cc08.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/sojejubo.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/tejoxipojumewed_ribozo_foxexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_5fd7990f74aad.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/zakugezaleg_towakiworaze.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/icao_annex_17_download.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/the_negotiable_instruments_act_1881_ppt.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/14f529683b5c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff55f0baaf31.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/linux_shell_scripting_tutorial_free_download.pdfIn PDF document text
    • https://webuseki.weebly.com/uploads/1/3/2/8/132814302/e1b9a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozujig.epizy.com/48520789219.pdfIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/calorimetry_questions.pdfIn PDF document text
    • https://4dd62b93-bb0f-494d-9363-2046eec350ea.filesusr.com/ugd/e54fc7_51a5aa9055d44cdc8af136bbba9cf7d6.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/mudidajekowuzasonufujot.pdfIn PDF document text
    • http://zetiragala.epizy.com/42765507490.pdfIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_248cbf7194a74c29839413c183d538b5.pdf?index=trueIn 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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 5708 bytes
SHA-256: 0ee87e63c67c106ee9046ea7ca376b663608bb35d32f42644856d4b1c222e30b
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11612 bytes
SHA-256: 604b609f0ced5f9fc4b98214e086c28863b95fd0f606d9856266a508d367c2c0