Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd6ce3cf28a75f6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 12:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e69c68b956efc8794ee4d563fac85558 SHA-1: cdc401e779bffb9519f7734e6c3fdfe8d738635d SHA-256: 7fd6ce3cf28a75f6a31441dce5f16f32044b8875013339afde6f0d9b70f60457
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential link farm, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=whatsapp+einstellen+zuletzt+online PDF link annotation
    • http://vitacanes.com/uploads/files/48340481042.pdfIn PDF document text
    • https://coil.hk/upload/files/17452055492.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/55485541618.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/92060614583.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pazovawomadutugepofowo.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/36405486106.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/60179633016.pdfIn PDF document text
    • http://hanifeugur.com/image/files/61618971964.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nixotuvexebukedokazuvebok.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/milugod.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vifaruxo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rimepavotoxebusojudiw.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/wosibizogexopupijuzul.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/20029918071.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614450f37b1b4---rorujipizibexokilel.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/37077638651.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132445802e02---kenadipolozobafa.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/8677051180.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/digoratiramevizakaxogut.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/sutabovukefuf.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/70749306892.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tawawomumanivotode.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/22273783306.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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 19028 bytes
SHA-256: 973a4ca3c9a7bb9aa89ae44c0f5fc8e23ccd7e2cb16535887e80909ff75a29f0
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10400 bytes
SHA-256: 7c4f71ffc438087fb2bf83f019c5de345ab24d401e2e5d5200ba53d06e8f959e
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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