Malicious PDF — malware analysis report

Static analysis result for SHA-256 63aba8ea4b67ddfe…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 04:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9769f753c66f0704f23d8cdbbbb5e931 SHA-1: 6591798961524f2dc32eea22d9b8e49624ac3bf4 SHA-256: 63aba8ea4b67ddfe5b0c7934854d2b8b96bb1bc042296e51a1918242ae59bf6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant number pointing to domains that appear to be part of a link farm designed to obscure the final destination. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, suggesting it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a55adad---1154130798.pdf
    • https://observatoire-omic.org/documents/file/34913318838.pdf
    • http://elisa5888.com/shopadmin/upload/files/zelutatepu.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/naxofiluv.pdf
    • https://granitabrasive.ro/editor_up/26865775881.pdf
    • http://pune-india.info/userfiles/file/wafokivixuvudiko.pdf
    • https://jager-ig.tw/up_photo/file/nugikovisalidatu.pdf
    • http://www.smpnuenen.nl/images/files/bumafileledulojiwedij.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/68954930623.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/dexuradisorogekiketo.pdf
    • http://familiegravesen.dk/userfiles/file/derovategutajasoxuruw.pdf
    • http://wakesup.org/userfiles/file/1085330927.pdf
    • http://ride-on-earth.com/images/blog/file/nedejoravig.pdf
    • http://as-eng.biz/userfiles/file/21567020593.pdf
    • http://stolizstekla.ru/userfiles/file/28951070229.pdf
    • http://zzzwchem.com/upload/files/pafedilopepegovugodenij.pdf
    • http://vinabomi.com/uploads/userfiles/file/zetifufuvoxajaxej.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_45296F83B0983BAB.pdf
    • http://serdceprirody.ru/userfiles/file/65768466861.pdf
    • http://galluccifaibano.com/userfiles/file/nevuxukufetesalox.pdf
    • http://peak-experience-europe.com/images/blog/file/xuxelunen.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/20757969463.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jaws+novel+pdf+free+download
    • 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_off0000c23a.bin
c04d07d9d027946c4da13e5669e0f5ca5201dc993304063a2c613c3f8e2d02bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 10444 bytes
font_01_sfnt_off0000da19.bin
b4f189e5486003912ee4d974c6ca44d251fa8684601544c202b2ee0f22b6ec67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 18392 bytes
font_02_sfnt_off000109d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 16792 bytes

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