Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b47a1eccafd7c58…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 19:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a53c7dd801b8023a513a1712902ab5fc SHA-1: 9967d07d49f4b3b2bab0aea690b12eb3c43645c1 SHA-256: 0b47a1eccafd7c5895d33c5b5137c337da3b7955717f3756ba7aa4ef28222229
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://colegiumaniucarei.ro/ckfinder/userfiles/files/46272623100.pdf In PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/93264215649.pdfIn PDF document text
    • http://unityproductions.com/upload/files/78928433017.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/68933479292.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d3f1e45---6836908648.pdfIn PDF document text
    • http://szwygs.com/upload/25595558440.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/rasumebafuretewevabusaki.pdfIn PDF document text
    • http://ingore.cn/upload/files/davipegufegamekonolabulu.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/9168691400.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/48735055521.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68925518588.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/837gsakq24opefckg9390uqu61/92977348013.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/43401360960.pdfIn PDF document text
    • http://jfe.hk/userfiles/24662526423.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_092787A51B494C99.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/16413414876.pdfIn PDF document text
    • http://a-pluset.com/userfiles/mobetiz.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sezivixagewidadov.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kevowo.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/33514771908.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/pinebosevuwetibalilemedi.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/11376116522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+u+facetime+on+androidPDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16920 bytes
SHA-256: c79f76e6e2a30dc04961851ffe2cc90f4864946f04c9f2eeada08450af4f9d39
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 10600 bytes
SHA-256: b6ad9cce405d8f561dde8eb04b010f2d3e50a7be910622238df594888f78dd51

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