Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37fda1b6fa9160d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 20:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64f70b48d85a1e82e5e7078cd94ca110 SHA-1: 9637fea595f3ec59bd02d0de73b0f36af27e70e9 SHA-256: f37fda1b6fa9160da08d031e53546b2aa7eaf9d87ae1c08acb05c3c724442450
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=puffin+web+browser+apk+download PDF link annotation
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/renala.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/79565163930.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/30558178237.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/69875768425.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/mowizetarufupalukexiriba.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zotome.pdfIn PDF document text
    • http://fpole.ru/sadm_files/ripabirekatuwaka.pdfIn PDF document text
    • http://moneymaker-gold.de/files/31390568541.pdfIn PDF document text
    • http://safetruck.gr/images/file/dekisokuforarixubiwokax.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910004852.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84175639686.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sopivetudizezutef.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/36333516386.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/figadutikegupa.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/45509449970.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///78357401376.pdfIn PDF document text
    • http://zimmerei-possert.at/16959127491.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/9954264524.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/detaraduvo.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/21625165300.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/33539751463.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mamodigepe.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/dotakigug.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_off0000c111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10812 bytes
SHA-256: 8d86b4ed5c8a10ef4b46920aa46a3df2b355dc7ab12359da1eedb4b2edd16357
font_02_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 20808 bytes
SHA-256: 62b19e3fa24a111dec523f3c75970fb5a35795cab9a8ac617019235ef579287a

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