Malicious PDF — malware analysis report

Static analysis result for SHA-256 b104e15d3260e568…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 17:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f734aa254b2ad23cfabd4cc05e21d36 SHA-1: 0d69d48ee5f1ce9c982c1168542faca300ab98fa SHA-256: b104e15d3260e5682681c9bd44fe14948209dd266ae6470fc96790e08257ef5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the true malicious destination or to distribute multiple payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133db429eb82---17395711521.pdf In PDF document text
    • http://ingore.cn/upload/files/gopewanifoluxopamikumi.pdfIn PDF document text
    • http://philipsphotographystudio.com/rabutir.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/16220836629.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/memaf.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/78328754624.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/28261177422.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/maroxot.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/94165425318.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/13740421970.pdfIn PDF document text
    • http://recviem.ru/img/upload/wobuxobofib.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/052352054650.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/44356374590.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/5325544285.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/31279464571.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wegizede.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/giziratibokipanikekaviwif.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tugedorumotuwoma.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/sisapeve.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/19055248017.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312349318588.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zexatizikixepowijir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vertebrates+and+invertebrates+worksheets+5th+grade+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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 15312 bytes
SHA-256: b275a55bd02331b974e6dccbe372cc3e9591e5b68e734b883f28f9b9d0dfaeb7
font_01_sfnt_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 11216 bytes
SHA-256: 93a65b4fdb4ccef23e241d2d303f10ed739d512b25c2bf5d77db31595edff87c

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