Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e91a68e5168862…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 09:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73da95412a9159f3e1debc03349262b2 SHA-1: bc5a51b131ab2dcf6e23cd783055794197e2ff69 SHA-256: b0e91a68e516886286e2d7343e2bacf824e395eb95283726ecf818d9f8255bd8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one prominent URL being 'https://drafthe.ru/uplcv?utm_term=call+karne+wala+app+download'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://drafthe.ru/uplcv?utm_term=call+karne+wala+app+download PDF link annotation
    • https://harmony.im/userfiles/file/zuxopakanariluv.pdfIn PDF document text
    • http://specimport.by/files/files/tadapixidenefanexaz.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/63944186667.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/69253264674.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/mufetogo.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/16293148472.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/buvofidolelafuza.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/xunomezavisamujoxivaleno.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/74753824848.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lekufitadukegom.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/61229865138.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/50849140849.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/89190585869.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/22109825256.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/pokefun.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/24834707862.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/60722140982.pdfIn PDF document text
    • http://imbirimbir.ru/files/gaxunefet.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/jewafowimoluzutuvaxizo.pdfIn PDF document text
    • https://eklyps.net/images/file/75345118077.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/jepelirek.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rejajipututig.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b35d53402c---92368188781.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/gikavenuwufa.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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 15768 bytes
SHA-256: 1546f6f11cb2c3729251a72a2dedf635b1b5c2b7972c22d738af8414ebe00edc
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10236 bytes
SHA-256: a3353aa76c5638d9f0366c95ea43f77973e1443a56317203b132cabbdf564ab6

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