Malicious PDF — malware analysis report

Static analysis result for SHA-256 638db83101aedcdf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 20:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c443cb7700955fc28657f905e0ea1772 SHA-1: 256485c7a88e4e1215a6fdfac00f7685dd6ad317 SHA-256: 638db83101aedcdf4a379772b39878c0ee5ebc028306b2a083275363e180a7ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests this PDF is designed to lure users to malicious sites. The ML classifier output of 0.993820 strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://pistant.ru/uplcv?utm_term=crying+laughing+emoji+android
    • https://shen-su.eu/gfx/userfiles/files/ridoduwa.pdf
    • http://dungcumaymoc.com/Images_upload/files/vaxodija.pdf
    • https://yellowstonewildlife.com/zixilowubefe.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/guziwatun.pdf
    • http://eichler-kammerer.de/70278597761.pdf
    • http://nuovartea.eu/userfiles/files/93770618850.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/61225329302.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/44114594244.pdf
    • https://ratodua.com/contents/files/vetabomebuner.pdf
    • http://letdentalab.com/img/files/luzasisuxap.pdf
    • http://digitalpolicycouncil.org/imagenes/file/28990656661.pdf
    • https://istanajp.com/contents/files/tigevedalelogopuv.pdf
    • https://clinicscrm.com/img/files/16698897154.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/40853487824.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/pimomusegapepumozetoz.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b4eale6ojuqulhkmvvhlvtaboo/biwosexagurusizumobujovef.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/aa512d2cfe19d72feda3c6903723aa31/59040703817.pdf
    • https://theurbanthinktank.com/files/ruxinavuja.pdf
    • http://asu78.ru/userfiles/file/pinifezexomuz.pdf
    • https://stauber.lt/images/files/natoropikunuxotureturiz.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/7315629745.pdf
    • http://augustaelectricalwork.com/editorData/file/lebewigut.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/ragofodobotu.pdf
    • http://vagtteam.com/userfiles/Files/4017351019.pdf
    • http://ballmillfactory.com/d/files/pitivemufolitiki.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_off0000bba2.bin
2f945532dcbfbbc56d75626fd6d751821ade467cb7cb8661e27653caeacb2bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16928 bytes
font_01_sfnt_off0000d2df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 16792 bytes
font_02_sfnt_off0000eaf6.bin
9254cd021bde39e9712470e73093da142e6a1fb606c0946b6669048513caf51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10804 bytes
font_03_sfnt_off0001035c.bin
43467bdefb164327595a270f7107c44cffd47619c36782bfc11f65685d8648f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 16816 bytes

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