Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc23ddc7fddea07…

MALICIOUS

PDF

80.7 KB Created: 2021-04-09 04:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 723672987c14bdcc10c3f352e0c7c191 SHA-1: 7aa054132e193adc52bd161e9129130a25649105 SHA-256: ccc23ddc7fddea07c835f113c117d87197801b7c62b90a711b5f34998ef32e9e
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to an SEO redirector disguised as a "free download" lure. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used to host a phishing page or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=the+revolution+will+not+be+funded+summary PDF link annotation
    • https://pediralesozalos.weebly.com/uploads/1/3/4/5/134595574/zalolupunatugu.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/g9har5n/xazanexupapirurejegeb.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/bogomedujusupiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/kOjjiAs/jiripugage.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/tabla_dela_alcoholomania.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/djbVggK/23582629092.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/djingfM/first_aid_training_near_me_free.pdfIn PDF document text
    • https://pisiteju.weebly.com/uploads/1/3/5/3/135314571/wenas_sukoneviza.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/5025612.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/30961017917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_dafe2f3e2e004e47be4d537e5ae41bcd.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_26b50f12df8f430f816e59cbf53c7f72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/bulleya_da_hasa_tera_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/do_you_put_a_comma_before_inverted_commas.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/love_story_easy_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/rajrmsa_internship_allotment_letter_2018-_19.pdfIn PDF document text
    • http://kowotasube.epizy.com/rinaludagaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/nasikifozax.pdfIn PDF document text
    • http://pojapudiwovoz.epizy.com/wamekifojegisetu.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_ab576c4c91a64923b03fbdc9112fc305.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_df5175d5ec1d4c93a3de60592cbad10f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/les_oiseaux_du_qubec_guide_d_identification.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/fundamentos_de_marketing_philip_kotler_11_edicion_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/11753337986.pdfIn PDF document text
    • http://nomekerileme.epizy.com/what_is_the_definition_of_social_science_research.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_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 5492 bytes
SHA-256: 72f1933cfb5c37cbfd5a7eeafc7f59d40e4a48abdf366e7d2268588edb1d2604
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 11040 bytes
SHA-256: 6ab016bf0cbc921cd268a3e525e45cef4a06ce001adf6efb4f2e09c004e4b381