Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e296686d76b66e6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 03:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b87959c6bdf8ceda3f98ed0a44259d SHA-1: ac2c673c4294a1cb7f52ba4db930c3027316c4ae SHA-256: 4e296686d76b66e67c01427635d52840587799a65be73f9c7f2bc0f817ecbb3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The PDF structure itself is also flagged for suspicious link farm characteristics and duplicate object bodies, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+connect+phone+to+android+tv+box PDF link annotation
    • https://e-motorcycle.tw/upload/emotorcycle/files/toremiroxinidedunanivebod.pdfIn PDF document text
    • http://innersolutions-uk.com/file/96009486829.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/24913381204.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e42f3dbd0e---boxulukifesorawoket.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/46428273251.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/83sj5icomua64pp5eiam1mdbgu/fanokerubagevat.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/60929155220.pdfIn PDF document text
    • https://proxus.nl/file/42636944962.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/nabowemozegojanewigowegi.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/85275846029.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/36115210586.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/kowenumubu.pdfIn PDF document text
    • http://meditopthailand.com/file/bebalafugi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/narotudowogowali.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/doworo.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81510532123.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210914171209.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/51180539820.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/33508328638.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sowimipabodeluxemupafuke.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/lixirawipepoduwumavepeb.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/29539046325.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/90043052327.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/38516259363.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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17368 bytes
SHA-256: 05cbe861e34a2f79e58b33a8fc8adfc36d8ee21e561272a2f2ab327823d7ccec
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 10784 bytes
SHA-256: a45b2f87b5897c184ed4b6d454e892c70864a244b56cd8fb41b8354f08c3be03

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