Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51a00136f469404…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 15:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16203c89bc0fcff100a4c2fca00519a1 SHA-1: fbc0fd4cad86f8111bf5efc56f690fb3db6e77f6 SHA-256: e51a00136f469404e592d844a079dedc9583fe25708f57d4e4ebae1447a06404
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=album+art+changer+download PDF link annotation
    • http://dietgame.net/admin/fckeditor/data/file/20210916150324.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/tikogikawuxoxorip.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0561a5657bc27999c38a28cdbf5b54cb/pufonowolejom.pdfIn PDF document text
    • http://abwva.com/uploads/files/tekaxejewigonemol.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/41955695193.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090516272754.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/tudilurorurozu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/58808459653.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbefa019ea---xekabiwesimifomemin.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/podowelorovasanimov.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090712031294.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/pudafanowarovikisi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/figadikonogasifexuxatut.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/marabarovekavepoxefo.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/raxuduvamokuloduvorir.pdfIn PDF document text
    • https://kawanmto.info/contents/files/60257550726.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/golikisuzam.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bijudupese.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/danalibanegiz.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/9412733319.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/50767695714.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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 10864 bytes
SHA-256: 9924214a6375bed3e917f445d8f394ee0f362a61f4b82a182e186da2b79cca3d
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 18232 bytes
SHA-256: 1b03a5a8deb2ed7fac2064417d6e2d6931f6fa559984bd8d257e0f7bfe70bb3d

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