Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c746cb55103938c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 14:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9385719ff0cece9bdd0b5229981fb7a0 SHA-1: 6c88fc0a6354b2fc4144850c743baa2d889e255a SHA-256: 2c746cb55103938c64ca5024c1746845949ea31c54d1c2c575224b7420f4b48e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=gta+5+spiderman+game+download PDF link annotation
    • http://goteneplast.se/files/images/file/16297762794.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/vilogufupizogip.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/93425248634.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/bibinew.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/30305096692.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lunotadeze.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/92554216294.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/28147836172.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/paxikojafewiwaxavulepo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/76264732836.pdfIn PDF document text
    • https://shibbirs.com/media/files/21788072574.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109070905533313.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/78126456441.pdfIn PDF document text
    • http://www.siposferenc.hu/html/90897936078.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/kosiwuxo.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/17340784393.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jelemewofusogijuvojorovas.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/61700915161.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/dujomiw.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7c0b02a5---13667885926.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/70306807595.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xowimegasuwawosonetozoz.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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 10996 bytes
SHA-256: d687ea385368f66117f3729bfd8ccaaa00269cf10c9ccfe6162ee284931052eb
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 18064 bytes
SHA-256: 3b3799fc6b4c595a01fbf9410348582f38f6afb21af2878f97d8fa869b8c7fe2

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