Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a56ce6d422fc738…

MALICIOUS

PDF

75.0 KB Created: 2021-02-01 02:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 126a0490f359e991f33538aab970baa2 SHA-1: 80ee186c9fe193eb61f28786278b36ababcd35bd SHA-256: 4a56ce6d422fc738443684cffd7b881bc3d844eb9c92c07a5e9d8ebd3e132b32
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically disguised as an invoice or payment receipt. It embeds numerous external links, with one prominent URL being https://leonvi.ru/123?utm_term=planned+order+receipts, suggesting a redirection to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=planned+order+receipts PDF link annotation
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/b8900cbb.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/9907046.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/regubad.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/cDUjdhc/keep_talking_and_nobody_explodes_fr.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/jffhjhf/kimave.pdfIn PDF document text
    • http://bekokasutam.22web.org/firefox_developer_edition_full.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/jajoxulabojaso/shadow_blade_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/toxicwap_the_flash_season_5.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/cleavage_blastula_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/mitezipofirizazarifi.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/sugebovida.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/38644342049.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/watermark_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/dalumunobovibe.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/buvuwekifi.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/38873622145.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/80759224316.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/91256872171.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/gamavimavimosuxazot.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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5068 bytes
SHA-256: cb0d07038dde44669fc2d7f09d69746559a4b6caec969f34d124fc48f144d173
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 10628 bytes
SHA-256: 9442580ebb99ef4c2b45602828c2a8be5759da46a1af37b89956cdcab9af876d

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