Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b81c5fff9a5ed66…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 15:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84048740d6a985e9fe4135d393e838c0 SHA-1: 23aff6740c5169b6462fafc7cf209a2481b67dc6 SHA-256: 0b81c5fff9a5ed664b04c674cc332a88fbd71828845aa6931de8772bf00e0887
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://vyveva.eu/UserFiles/File/vuzofumujinanumup.pdf In PDF document text
    • http://1-cities.com/blog_images/blog_/file/87933626433.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pavifobalofojevapegaf.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58250429751.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gewixomatis.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/muzuvilulu.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_DA35505721C65823.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/38671135146.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/96632709230.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2666497851.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fogadusigudadafov.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/76773779107.pdfIn PDF document text
    • http://remobudostol.pl/pliki/63120789776.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/64cf26de141b0b2e95624eded7af7874/duzegadamogesupob.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/81089817151.pdfIn PDF document text
    • http://runo34.ru/attachments/file/sofagutaputo.pdfIn PDF document text
    • https://samudra99.com/contents/files/47255434528.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/mofotajibife.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/71545688747.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/xegopo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/43194610549.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pelinalefurepijesuduba.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/mevodelogaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=roman+shield+template+pdfPDF 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_off0000c40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40E 10708 bytes
SHA-256: ba2e0b00c015feabd479a5521040e0a0c390c134e7b172c7f39c8f7a08d8e3cb
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16496 bytes
SHA-256: e7b5014095677bc02570facab20914ca99a325df8b12d90b91835a07c2b7b81c

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