Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9312dac2b6093c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 18:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4af2b1bc550158777926b16e1008c16c SHA-1: 692957cd1aa7a24c8dc16fb60fc8827462278272 SHA-256: 5c9312dac2b6093c57d1e252598b82f25caf50a7d72a61c873507d07d9509d47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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 http://spprp.pl/userfiles/file/5013452226.pdf In PDF document text
    • https://doktor-ara.com/userfiles/files/42198563453.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/3458410421.pdfIn PDF document text
    • http://centromp.it/userfiles/files/34455658621.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/93213649003.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a074e52b9a---30277195580.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mibozegodawomovobu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/81137218549.pdfIn PDF document text
    • https://onecre.com/images/content/files/70951729000.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/33295321894.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/18067051234.pdfIn PDF document text
    • http://vkts.se/userfiles/file/fuzibi.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/rimerelanagonunekaga.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/11172994434.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39490319822.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/fatevigemerutod.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42171885356.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/46191584361.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/38320845981.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/wavidowabizefufanuvaro.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/lanusemelitefepawo.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/68260847226.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/82373353503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=carrom+board+hack+game+downloadPDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 10808 bytes
SHA-256: c37593848bf820214bf16f929375a7e741a9b4fea53ca1e481300c7af1db533a
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 18192 bytes
SHA-256: 7e8a76ee310de355865ef03a086884e10e312863424023d0dbcee42c5d08854f

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