Malicious PDF — malware analysis report

Static analysis result for SHA-256 765f77102f471e0d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 16:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 848eaab78a162643584b8f0ac72a0f2f SHA-1: c7ac83009ba0e028c6ac0187bc84fa37ae29e829 SHA-256: 765f77102f471e0d1eccb7b3bd6619aa59d72fa39e0a7e04696f4e90914d7026
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=how+to+fix+dead+android+phone PDF link annotation
    • http://starcity-vinhomes.vn/app/webroot/img/files/vemiwejenevipojokata.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/48315880532.pdfIn PDF document text
    • http://varvshistoriska.com/file/lalikubanozonewajozaxoruk.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/nufarifexitogifupi.pdfIn PDF document text
    • http://nguyenhungstone.com/uploads/image/files/66640453129.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zosuvojonikako.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/40074600606.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/34910819588.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139717877417---maxabojefivobir.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/josaluselobixisuz.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/jazemolazujanodapu.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dedalusodibujada.pdfIn PDF document text
    • http://hydrem.ru/images/file/devilukapevudotowikezon.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/kavuzugaboxenize.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/1771451191.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/85950943128.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/10/64880485557.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc175ccc7c---20398025099.pdfIn PDF document text
    • https://digireg.lu/upload/fufiv.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zevase.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/34144678927.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10560 bytes
SHA-256: 45fb49d8063284cd7d8b60fc90afe218ed890afbb9a0f2c9e9661349f54909ec
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 17972 bytes
SHA-256: 0bc3ac96ba2d7822b3c33b34333e4987502d90e70293efa8e1ef4fe84b8fd92d

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