Malicious PDF — malware analysis report

Static analysis result for SHA-256 8138d155f79e403a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 18:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3af9eabb7420c6691a7d1d3e6579a821 SHA-1: 4a0dedb6753e5be2cc00396d0a742932b3c170df SHA-256: 8138d155f79e403a20d85e8a485654dc530b6457a560882d11d4cf87d151b39d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=rocket+league+sideswipe+download+android PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bulaz.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/47949935009.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/6544436203.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wikexerewosi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b57bb9c0a70cfa0c31cb1ad0de1bdd60/fuwow.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/29450682915.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906170140.pdfIn PDF document text
    • https://haidangpc.com/contents/files/poxazavevebojowesoniwuwa.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/rexunorezubobesuj.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kamut.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/93149228231.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/werovupokasinolok.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/18077523289.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/81304810968.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210918152337.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/62213873994.pdfIn PDF document text
    • https://mcsfood.com/images/file/87790840847.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142fea3ee01b---nujizo.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/zikuvibonenizi.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/gewufugifasolapeb.pdfIn PDF document text
    • https://festacontinua.it/public/file/fepevumos.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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 11012 bytes
SHA-256: 15dbcf9e12814401c6ec66f966ca4cdbd74db28bc2e224b4d391fdf1c1c89f31
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 17252 bytes
SHA-256: d375ccd493d2ef60a4ba3b90461767aafb888ff530d3dafc2ddd9805eddeba99
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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