Malicious PDF — malware analysis report

Static analysis result for SHA-256 1777d4d4af5606d8…

MALICIOUS

PDF

67.3 KB Created: 2021-03-28 11:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 90f8f17d6ca613d3992919fbe43394de SHA-1: 4822936dffc596fd9086207c89a1f07702f9cc7f SHA-256: 1777d4d4af5606d8af5620f90c0ce8731687765fb6ff2fa07073db14825c1e90
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including 'https://ponafet.ru/award?keyword=study+iq+current+affairs+2020+in+english+pdf', which are likely used to drive traffic to potentially malicious or phishing sites. The PDF structure and embedded links suggest an attempt to manipulate search engine results or trick users into visiting these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=study+iq+current+affairs+2020+in+english+pdf PDF link annotation
    • https://cdn.sqhk.co/gogojelawov/cgidhjg/guwemufuwigavofoniwu.pdfIn PDF document text
    • http://kemirulopifixu.22web.org/reiki_level_1_attunement_steps.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/gulebirajubaw_dojawifukujiv_vapedifemok_tuxojav.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/3693054.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/pekotuwemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5ff47e4756154.pdfIn PDF document text
    • http://deviditiposu.iblogger.org/bilebipunuguzu.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/fSRhgQ2/original_clue_board_game_pieces.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/jetetekapiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/5igVthi/sudoku_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5ff5f8242e269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_6000688daef41.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/gorisisexapozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tegolekigi.epizy.com/95416817852.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_1d5eb6f0e6924beea7ffb52a0d6068f4.pdf?index=trueIn PDF document text
    • http://pamixawikisif.epizy.com/wopuletonatiwowusu.pdfIn PDF document text
    • http://vekoxoke.epizy.com/1283263931.pdfIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_e77fad1aa0aa4b8ea959ef8577afc74d.pdf?index=trueIn PDF document text
    • http://rumadedixigiwu.epizy.com/calendario_noviembre_2020_para_imprimir.pdfIn PDF document text
    • http://gelepovasogadax.epizy.com/53958365023.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_2c74e73402e34acf9ea9fa2ba3e5df82.pdf?index=trueIn PDF document text
    • http://deniketeza.rf.gd/79932753503.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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 6024 bytes
SHA-256: 581ca60faaf92247496019f45e08ccb7fc37c39e2e5120ae248806ec2bcd00f9
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 10040 bytes
SHA-256: 1e370424b7e42e0ff400b92c31303bdf461bbc724e03b66d11ec91bb81a85dd6