Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f64f6a44e11a32…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b4772fd885105a3c3464c35bbdfdf2a SHA-1: a5f79085107b170457dbc38dd857ee74f851b9a6 SHA-256: f8f64f6a44e11a32f5bb6ae1303fd8780fa2013ed17735cade68f2f6450a7939
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=mod+frontline+commando PDF link annotation
    • http://fluorescent-training.com/file/48129626284.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/ninimorasilijetagetej.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/xibur.pdfIn PDF document text
    • http://393citizen.com/upload/files/xuginagomase.pdfIn PDF document text
    • http://chineseclothingonline.net/File/woninewasafizelejanifofo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/10871752074.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18786245435.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/vinifixisosolemifof.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/tuxixikewo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/85252507132.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/54729900006.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b4908c6d---sebetu.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/topegapewizuzakewe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nojawebeke.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/gazab.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kirepipinabulemurixiv.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48304456957.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/dawisenoboj.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/8408061525.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/59484934121.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/61033768750.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/799385b0247ce8e154d9dd0023ed3f1b/xojub.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 10460 bytes
SHA-256: 7c6ecdc3a11e0dd98a3a795446f11a271271a1bbeae8cff5b3f4a1af6c180769
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 17180 bytes
SHA-256: 3c2c76583865c3d811ea6becdc05dbd8ad398c34181d2621e8b85b0c67cc4518

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