Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70c0ebb6f01dbd3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43988379d914d0fc0862b80e091889cc SHA-1: 2b9ba641d7514570bb10252274877d35026d3919 SHA-256: f70c0ebb6f01dbd31015abae928bb5a812dd33b9664ea6aff8c9604c786f7176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hohsingfiber.com/ufiles/files/20121893510.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuwegogowevixakox.pdfIn PDF document text
    • http://all-premium.com/user_file/files/58888019294.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zavufabunozosubo.pdfIn PDF document text
    • http://kag.fr/userfiles/file/fatax.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210920155457.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/sipuvofazemofojizumewifo.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/2656122840.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/viwobivifexisip.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/jigolatafat.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/26638110238.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/vefilatebiwe.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/wonoduvuba.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613faecae8724---25917525727.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/18643081098.pdfIn PDF document text
    • http://yongqingtech.com/d/files/fekevubapeke.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/jezefejapunenetewi.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/58434720780.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/bigibu.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/38816170131.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/75091613844.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/paronijabarovowegive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=character+sheet+5e+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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 17168 bytes
SHA-256: c136cce54dcf12560589d0e42d999fe8c8bc7a38c53aba71b22b8e3188fc61d6
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 10520 bytes
SHA-256: dba8b71debaba0356db3871cbcec16b03e3b57873757044d98a606493843d7fa

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