Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c23312a5e2417c…

MALICIOUS

PDF

77.3 KB Created: 2021-05-22 12:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f6dce2843c2675cec43e120e0616c029 SHA-1: ca9c3ce0b0932ee3f89de1b2c4fb14222ea1e6e3 SHA-256: a3c23312a5e2417cfe37a75d7e734dc2b97f3d05e3eeecc0e1e20d321e427f28
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially phishing-related. It contains numerous external links, with one pointing to a suspicious domain ('leonvi.ru') that is likely part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=how+to+clean+ideal+air+humidifier PDF link annotation
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/73523737b01.pdfIn PDF document text
    • https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/mifuledoj.pdfIn PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/7c554f1ecb6e921.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/begoxenazez_metipupirezum_raletixex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/wondershare_filmora_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/87085935757.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/what_size_tires_are_on_a_2008_jeep_grand_cherokee.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/37755044864.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/manefokujojokalovaseto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7835e17-0c90-42de-a5e2-e4398b5a6b4c/gupotimuzepawisunijo.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/zezeletujejabukusukosod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1bbc60-4f11-4884-8c1b-020ca313554c/how_to_remove_and_replace_t1-11_siding.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/roland_micro_cube_gx_second_hand.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/28860831161.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/were_going_on_a_bear_hunt_song_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/63322132031.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/1360394374.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/kepijewepaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/candy_crush_saga_apk_free_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/how_to_setup_thinkorswim_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/cerebellar_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/universal_studios_osaka_japan_guide.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_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 5136 bytes
SHA-256: 61af8bcceaa668ce8e1335d87fdc72940aa7bdb30029a5b82a2950c810664c83
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10788 bytes
SHA-256: d19c1d7f74fd9c933702f60a2a9683388cf9d751e74736e6078a8c5ec6c400e5

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