Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd97bf3ee7d5c6a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 07:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 09fd7c5345ba4e2bcb92f094adefb0e2 SHA-1: bda979b202b9bd6d58950f7eb6eee19772f6556b SHA-256: acd97bf3ee7d5c6a1bb563320e7971a7d8d0b8ad7a78f2703847a1c0d2dafbae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=minecraft+pc+download+free+apk PDF link annotation
    • http://www.tomasjelinek.com/img/pub/file/puwesupeteged.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bifuzos.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/vodek.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/31668242854.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/50413252820.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/totubovopevedukive.pdfIn PDF document text
    • https://kawanmto.info/contents/files/60257550726.pdfIn PDF document text
    • http://gewald.ru/content/Files/fupajukapegaviduvemoza.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/50619571504.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/ziruperunuxawow.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/697877618.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/wokuzuvo.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/32039613729.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12453682210.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/6926935567.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/93176791502.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pasoridazizeruzejuzofuf.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/40146429726.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/rebujase.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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 17680 bytes
SHA-256: a75421f78efc5cd5cc8eb5e29a82e0aad6f6f311704cc78b3d9671cbe6022661
font_01_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 10616 bytes
SHA-256: 53bd5f121f11aa111a29f144e993314980122970a8072baff8d2ab0455d7aebd
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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