Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f890d58feb09545…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 20:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 821b725c1f07aeacdb3528ff093caf91 SHA-1: 96b5c5dac176f8a9423a0bd36b4abd47f17d9444 SHA-256: 8f890d58feb09545e6b106fbab2ae96597f5599e945602100e9d344a3caacf5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=unturned+metal+rack PDF link annotation
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/15375b3d48be99c9dff707ab9f0e95d6/kisawiwuvipunibodulivizel.pdfIn PDF document text
    • http://web5gstore.com/Files/files/27309797361.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/48072523449.pdfIn PDF document text
    • http://unibox.lv/files/text/bupipozoru.pdfIn PDF document text
    • https://baglab.pl/galeria/file/39831119508.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/77887379704.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xobat.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/jagosexibirulatojoguvux.pdfIn PDF document text
    • https://izr.fr/files/87742104686.pdfIn PDF document text
    • http://186086.com/upload/files/17934010527.pdfIn PDF document text
    • http://pb-book.com/user_file/file/xujudaxuretavoromaraz.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/nutekevulukazo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/31481500693.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bogijeralupanufamepapa.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/37108105904.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012145159176.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/bewomubogapim.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/besekakarel.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/jerewizifuwejamixazev.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7a07b751---titevuw.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/najavakakesuwasuwoki.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/96268909157.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 18284 bytes
SHA-256: 26b7f385350e0af6c3aa2261c3ce75eee88daf559b43a88b7e6e869d66ba12a1
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10352 bytes
SHA-256: 6db4c282e9a7a86a8081da0465c59eaa39f2fabd114b0d73217dc7ca7eb346e9

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