Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ea1c494f746d82…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8bac4e7177263926260d105dddb1f32 SHA-1: 4c3491f8f42561a8271dbdabc955cc072a5248fd SHA-256: a0ea1c494f746d828cc2d29402640266f646e10b961c74bc7838628e94e103b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF is also identified as a link farm, with numerous external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=air+attack+2+apk PDF link annotation
    • http://qlinairnv.be/userfiles/file/lajizib.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fenowuwi.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/vedalekazexoxe.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/zakidizonut.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/bozudasumilegomorakupofu.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/mibetesubuxut.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78edbe451---xewiluw.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/fatexu.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/zogaxapasuvavi.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/87736545902.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/pokoturevabig.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917215357907.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/38449457754.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/makok.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/bowafosiserojujoke.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/69075904870.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vibewo.pdfIn PDF document text
    • http://a899.net/userfiles/file/nujamikinawe.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/37413534303.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/22914620871.pdfIn PDF document text
    • http://renknh.com/ckupload/files/wewijekobivitole.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea4db5b50---voduwonejod.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/94854793316.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lidiwinubarulolodebi.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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 9988 bytes
SHA-256: 3565ae67f6382b4d56e34ad14e02654fe380fd7c0ce4cbef268a295ff6dd7eb0
font_02_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 17884 bytes
SHA-256: c898d838f1dfdf0c8ca521e6eeb620b85e36493ae812d61b60e3a8854e23a42d

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