Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e22c39a8174b95…

MALICIOUS

PDF

97.2 KB Created: 2021-09-17 11:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4600ac0f12368d33758375f75dd5e544 SHA-1: 0438e870c4d793aae86b52c99a31caeb954ef3ee SHA-256: d1e22c39a8174b95dcb55ce4a111db9a66ed2da991dd52b52c4479c63c5e8192
134 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, a common technique for exploiting vulnerabilities or delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links, many pointing to PDF files on unknown domains, suggests a link farm or redirection mechanism to further obfuscate the final payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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 https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/aejroo1edvgv6f4ldohveeuhvb/juxuxap.pdf
    • http://alhouti.com/userfiles/file/sileligo.pdf
    • http://zespolbahamas.pl/zdjecia/file/44781215076.pdf
    • http://baozhaopharm.com/upload/files/46136028874.pdf
    • https://windfreeklima.com/upload/ckfinder/files/gojumejivawizolafoni.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/wirumugarutudagisulufuxi.pdf
    • http://sjhrz.com/images/upload/File/sebiluvebusesixenumevidix.pdf
    • https://copacndg.com/images/uploads/files/50770286318.pdf
    • http://vvk-wiedermann.at/userfiles/file/36610746057.pdf
    • https://bipalisdemo.dashindonesia.com/userfiles/files/22383995812.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/75834247767.pdf
    • http://laxycoffee.com/upload/files/gukefijufabosovixobowuz.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/faguga.pdf
    • http://taxicityplus.ru/userfiles/file/6043258700.pdf
    • https://robertbah.si/files/file/91219012212.pdf
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/50752511720.pdf
    • http://sudeoksa.org/userfiles/file/20210907112927.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/11628981531.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jasobofofemone.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/98647784762.pdf
    • http://phucuongplus.com/upload/files/dexujifekapititov.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/badopebeke.pdf
    • https://sweetburden.com/upload/users/files/livubogedeb.pdf
    • http://heninrealty.com/userfiles/files/84536642012.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=carmina+burana+score+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f100.bin
19117959df3b1bd3c4e52e8d24cf6409533e902997716cee8d7ec709ee30dbdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 23308 bytes
font_01_sfnt_off00012ddf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 16792 bytes
font_02_sfnt_off000145f6.bin
0288423581f150c9ed8b51ddd012c363d3c4dec6c131e5979372dd79ccbd6809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 10908 bytes
font_03_sfnt_off00015ef0.bin
56ed7f171c5c376efcd16bdea2904aa6543a003369618059ef0886c9484a4267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 16540 bytes

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