Malicious PDF — malware analysis report

Static analysis result for SHA-256 22961d2bdc84aeac…

MALICIOUS

PDF

92.4 KB Created: 2021-10-09 07:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 912bf63c43a40e03266b07dbe6fc6a7e SHA-1: ce02f3b3f3f6300e5a3e488de89c07ddb545453f SHA-256: 22961d2bdc84aeac8731b5923a10ed3e04528a1ab80c5caa9585f34c756dd102
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9810

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://poliinc.com/upload/files/ligafezew.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/82862749772.pdf
    • http://antonio-pelella.eu/userfiles/files/99494484018.pdf
    • http://baohanhranghm.com/upload/img/files/64428300190.pdf
    • http://classiccar-jp.com/js/upload/files/xemik.pdf
    • http://x-site.by/upload/editor/files/98964298308.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/latemubirusojexibi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16160ffbd4aa62---37313297355.pdf
    • http://liderzy.natura2000.pl/imgturysta/files/pozenurudojutipume.pdf
    • http://villalapinetafavignana.it/userfiles/files/xelufebexetanikefipigu.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/tidiv.pdf
    • http://suamayphotocopy.net/userfiles/file/gexilotuxazo.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/lakogodatopi.pdf
    • http://hoigolfbinhthuan.com/users/files/vifapipu.pdf
    • https://bor-diing.com/upload/files/litinibe.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/19850495122.pdf
    • http://classtool.info/upload/files/87330485393.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/63692057356.pdf
    • http://gynekolog-zilina.sk/uploads/fck/file/momos.pdf
    • https://bucatariizidite.ro/printuri-fi/files/92524101744.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/biwizifutagipasol.pdf
    • https://dampinggame.com/calisma2/files/uploads/todituzun.pdf
    • http://sutipatika.hu/userfiles/files/98074614774.pdf
    • https://cafemocion.com/userfiles/file/xisenorubojirolezabag.pdf
    • http://goref.ru/files/file/nomope.pdf
    • https://htapigroup3.com/contents/files/57130940647.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wuthering+heights+book+club+questions
    • 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_off0000ff8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 16792 bytes
font_01_sfnt_off0001179f.bin
5b3a5bfc42c5430f35a58465c126ce4730aa7e8046b3e0894fe173a5e40d294a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 19624 bytes
font_02_sfnt_off00014b6a.bin
25432c9d048c78747e4146b98b2ab0c3b26557eafbc02432e44e89fb9390daec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6A 10820 bytes

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