Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a0d1b8c6e342af…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 00:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 793ae361d726dbdd7109a0b1695c62db SHA-1: 495e4a8d696e82e582c8378876b95b4e636e36d7 SHA-256: d0a0d1b8c6e342af50b79448f49f80492d5db5db632e252010ad511787d96c7a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to external domains, many of which are likely disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=fastboot+drivers+for+windows+10 PDF link annotation
    • http://ranchobg.com/img/file/koxifapovitalinuwawumik.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12778938666.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/serolugolaziviwo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xerokosupuwukodakusokaz.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/gabovexivo.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wuguzurivolafuz.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zasomuxewo.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/62250431378.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/vasotabedudabegimob.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/5691529.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/87112658352.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/silelarujagup.pdfIn PDF document text
    • http://jiab.net/userData/board/file/41445080618.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/rajuzosel.pdfIn PDF document text
    • https://coevent.ru/upload/files/mikinufokidamavapewutegi.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/nabesiwikipelabipejuwatak.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/41540552711.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33309037942.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/98048301782.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/67165829843.pdfIn PDF document text
    • https://medtek.vn/storage/file/nafaja.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/gemigu.pdfIn PDF document text
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/49089755700.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/matogizububok.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/35482971512.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://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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 10744 bytes
SHA-256: c340403b3c812dc8c2ea41e8660c8fc0b99dccc6c5ee0c7fb10c07b911ad38d3
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 17384 bytes
SHA-256: c185df03c71d185335970d9e043e9f3fe5053e191c339a3ab465e6b9f5800e2a

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