Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91180e484c87e73…

MALICIOUS

PDF

91.4 KB Created: 2021-09-19 22:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3b058696e53709337b8f9fac53e88268 SHA-1: 4d1830131019386f44af3465772a3cae2d5b4e93 SHA-256: e91180e484c87e73edd0de8ab16aa861dc8747ddbcc9fd08ba2aed0ef5e39a10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=among+us+play+now+without+download PDF link annotation
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/juteru.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/tonatazakadanuxiji.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/195a7adf4f4916b632c0de2226861a80/37048244020.pdfIn PDF document text
    • http://orthodoxnews.us/file/likazisabojukoba.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/19577174082.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fogegulufadipi.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bowixelid.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/99608276024.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_041501_122.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614208cb086f9---63463374114.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xejus.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/7509324183.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/71654114589.pdfIn PDF document text
    • http://annabarons.lv/files/files/sisawele.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/97801057526.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/653a45ff85a545d9d815684997becc41/96821065682.pdfIn PDF document text
    • http://gekon.net/userfiles/file/67739116413.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/82926503228.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sibudufigobopijiziralisul.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/51884215664.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/89545574703.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/pugaliwolowitixejam.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/35440448871.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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10888 bytes
SHA-256: b39bdf98c59725f4b6a992637b5e93234633b55abf51ff76df2ac5e7b7986efd
font_01_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 18960 bytes
SHA-256: a8b9ea5013e19a12c1519e545eaad7fcd85f1f041e601dab9718fe18c91c131c

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