Malicious PDF — malware analysis report

Static analysis result for SHA-256 68928134a41b2bcb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4c6c72e0fe1e21d7a731218ce001ba SHA-1: 6690f0333c339f5ac6680abc4391955b07832fa1 SHA-256: 68928134a41b2bcb85f8f26a02b29bafee5aa4eecb27f41f494abf92ce3edb42
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the URLs are part of a spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://cructi.ru/uplcv?utm_term=online+cbr+to+pdf PDF link annotation
    • http://trustarshida.co/cache/fck_files/file/48001261996.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/20438467229.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614206b36299c---xonabizojimid.pdfIn PDF document text
    • https://oasis-travel.ro/files/zabetatutowuloj.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///70354719290.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/60167119527.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/rumepov.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/levizozoxemekerobadiwiz.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/22587314495.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/66023030342.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c81046e7e---55232178540.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/84629390845.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/68440658555.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/bawokikajo.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/lidojamaxek.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_135158_181.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/lotovunubinanawiru.pdfIn PDF document text
    • https://grandegroup.net/files/vixagogelipulefajowaminuz.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/bejumoli.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/jawedap.pdfIn PDF document text
    • https://architektor.ru/uploads/file/15963059563.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/mabuditigodagizuminejenam.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71604876829.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/15685618892.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/seworedevajutufimunuzix.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58156965067.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/tudijobe.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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 20032 bytes
SHA-256: 78c0087205a59c88bf7b5fc39cefc79e532311225d52f7a5b92c3b3751e01ecc
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10448 bytes
SHA-256: 286c3b43aa8bf25a48dc69b57b16f2ff5bfcd96e211906739e34443a087700f6