Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e94c9bf338d0f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-12 14:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2b0664c57cea29f46fe6a553392b606d SHA-1: c51944102f9dc0676b98227be770f62679bd3c51 SHA-256: 153e94c9bf338d0f7b7b07283dc5b402888e697f7e6d17d2322489f84a614888
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, further supporting a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/aws?utm_term=baarish+yaariyan+song+video+free PDF link annotation
    • https://cdn.sqhk.co/jigavozef/feEjbMm/digiromania_plata_factura_online.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/tekivugokulub.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/27742e3.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/arAgg1c/looping_video_player_ipad.pdfIn PDF document text
    • https://site-1168528.mozfiles.com/files/1168528/fubimuligiburavidivitot.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/pabozeses_fadeg_gupinoxun.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/ee6f003b7a.pdfIn PDF document text
    • https://denepuwukofakar.weebly.com/uploads/1/3/4/3/134316944/pabof.pdfIn PDF document text
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/sovas-wajegaxota-kopodu-jopemakonowan.pdfIn PDF document text
    • https://site-1168150.mozfiles.com/files/1168150/online_business_startup_checklist.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/faily_rocketman_apk.pdfIn PDF document text
    • https://site-1173456.mozfiles.com/files/1173456/780620637.pdfIn PDF document text
    • https://neberesoz.weebly.com/uploads/1/3/4/5/134512227/gosedizetumogu.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/4138968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 5348 bytes
SHA-256: ecb8ce6c04d03e43ea43824e34b9f390c31bb5a6a22faa51811c5c92b3835b24
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 9824 bytes
SHA-256: edeb708d77d430e3a25983ce9c94693cd373b5344af29f90fef490622f1b162f
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 18776 bytes
SHA-256: 1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6

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