Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa2ab72e940e678…

MALICIOUS

PDF

76.3 KB Created: 2021-09-26 13:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1fc4d88ca252c3310888a7bfd7c97de SHA-1: 8017f7a94e9d633e672545d7db9aef3299ef19af SHA-256: 4fa2ab72e940e6785084281d17c0a712adfd3fc91cd6048bba5f5d031098add0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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 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://asken.as/bilder/file/rowulelutisuxeludokefevu.pdf In PDF document text
    • http://tottazo.com/userfiles/file/73054452566.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/suxosorupinedux.pdfIn PDF document text
    • http://p-energo.ru/content/file/sisovafedetegiwazidope.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110023121227.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bivaxajuxoludodudajef.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/11802610357.pdfIn PDF document text
    • http://devison-matras.com/upload/file/bazitugif.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/modomimu.pdfIn PDF document text
    • http://chemicalengineers.ie/images/milegalosoledotawizitejik.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/tosesufarezipefef.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86280870531.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/gapojosulofoke.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/50857729575.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/60504930193.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/44949962467.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/babemedafulofuw.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/68549659178.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/23614651965.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130b434574e4---68614603887.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/23044955021.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/18532165705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=video+guru+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 10312 bytes
SHA-256: cd0a105687bfcaa06c5d3291b366625baaa02ac1c2c22e4bf1d4489f586c662f
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 18664 bytes
SHA-256: 61b2d99ec731244159b44ef0b67da5eefc16781dc678c1851f8b166514c5710b
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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