Malicious PDF — malware analysis report

Static analysis result for SHA-256 836cfba337415b9c…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b0b8e2d4dfb2171d5918c4e1d251d8d SHA-1: 6754d9bbc40984e6d6492067ec34e6d7e47bdc6c SHA-256: 836cfba337415b9c9172ff4b8a7e04e6ee691959621e81c0bca59cee5330af76
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, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one pointing to a link farm, suggest a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=baadshaho+full+movie+watch+online PDF link annotation
    • https://kawinlari.com/contents/files/givokulofowogimeb.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/80171243491.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/tijojefowufuxepilivu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/51517884845.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/gulib.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/ruviduridujuwufijesode.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/87993540776.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/67893816076.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/gijut.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/14565882898.pdfIn PDF document text
    • http://fohow77.ru/upload/file/pudebagobavetafexexu.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/kabolal.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/49295039455.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jarepabaxa.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/dadopokusaruxefefulizef.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461a5e7ddf7---kizuvifatamiz.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021091104342247337.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/gudowun.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p24t6ohnbjd03b6t2rpacn2ppg/41671839360.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/56750387596.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/82192230165.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/96543605337.pdfIn PDF document text
    • http://cobmedia.hu/include/44914311965.pdfIn PDF document text
    • http://djapm.com/userfiles/file/nifozu.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_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 10944 bytes
SHA-256: 5ab35ca268c3266284ce947f3db446d1800b935d64603a2c958f84901bff0785
font_02_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 14876 bytes
SHA-256: 732e5841c87da4bf336925a8c9b07e2a71ff060d7be176f9aedafc3f56dc9684

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