Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5cd83b002234a7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 18:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29173799d4ff7c95585b50fc38a5877 SHA-1: 7dfb9d5175df80fb826327a1c0cb4debbf252877 SHA-256: 1c5cd83b002234a7fef9e4892342cd642d8dcca5e7d4272b967c66453b4aae8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=novel+opening+lines
    • http://enovosti.info/ckfinder/userfiles/files/41293592422.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24444004372.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/13693872897.pdf
    • http://streathamtaxi.com/survey/userfiles/files/lusepotorimigavolifet.pdf
    • http://chongros.com/userData/board/file/19966253851.pdf
    • https://sabunwangi.com/contents/files/1295205628.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/10132733598.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/32053648089.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2cc9be11d---sijij.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/fezij.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/52943029276.pdf
    • https://geneolock.com/ckfinder/userfiles/files/bedilit.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/73289197493.pdf
    • http://kaies.cn/upfiles/file/xinojezakobosuv.pdf
    • http://f-okinawa.com/img/tmp/files/20628944770.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/vuwubijunixav.pdf
    • https://viadagio.be/userfiles/file/42032227511.pdf
    • https://umutfm.com/resimler/files/wunezudirexigolivug.pdf
    • https://forumsevens.com/images/file/69772097233.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/53799492837.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/16838904132.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/serobogipavesavusetago.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/fadosup.pdf
    • http://odumakus.com/uploads/files/pimesulamofeba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee4.bin
ac26008329f1964215b7ec9a4ce604feade333fd6403e4a948f3310cc0648827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 10112 bytes
font_01_sfnt_off0000c589.bin
a30209eeb771703d49f6182e38feb8a7430bcf7ef10b5539428fbca610f9b06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16480 bytes
font_02_sfnt_off0000ef65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16792 bytes

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