Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed19373fe0ee65…

MALICIOUS

PDF

85.5 KB Created: 2021-04-12 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa69110b281cc6ecb1a8684f591677a4 SHA-1: 25a241aa9aa3bf11b942b338849a79b1b9a33db8 SHA-256: b5ed19373fe0ee65bd8212007cc91219d698b49a89aed38cabae467c805e4a35
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=what%2527s+in+taco+bell+breakfast+crunchwrap PDF link annotation
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/judiwepuwofas_lepinogonokax_tijologuruso.pdfIn PDF document text
    • http://gprofights.ru/commerce_mcq_gujarativnkil.pdfIn PDF document text
    • http://white-x.fun/44511083715g8bq4.pdfIn PDF document text
    • http://usesol.xyz/afterlight_pro_apk_freeyihcq.pdfIn PDF document text
    • http://gufolosolikivu.22web.org/4795985970.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/b40839.pdfIn PDF document text
    • https://fotunerabo.weebly.com/uploads/1/3/4/0/134042859/65086.pdfIn PDF document text
    • http://ribuvegiruni.iblogger.org/my_autograph_kannada_movie_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/rt-n12d1_admin_password.pdfIn PDF document text
    • http://gagimuludodu.epizy.com/dell_u2913wm_vesa_mount.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_4c7095390e8742849c6385bfd20ac176.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/72180553317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2705fa-8042-4778-9864-74e95b3f2c19/13781999761.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_8f56e89121684bccb29f143b5c3caabf.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_4890decef05042d6bcbbee8ebd4246d9.pdf?index=trueIn PDF document text
    • http://fumutomuwe.epizy.com/32700832640.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_e9db43f282884f0e89d5cd0b0563612c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8e5911-f590-46e1-8851-7734a24e9cbf/cual_es_la_clasificacion_del_derecho_social.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/98039809046.pdfIn PDF document text
    • http://rafesule.rf.gd/83735898613.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_fe9399732dc64176b14b54b0bbcf1f5a.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 5448 bytes
SHA-256: 51cd4473073d2f6c3f5610b2a11138410848c3f778e33f883fa9c7afb8df1ea1
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 11436 bytes
SHA-256: ec525c2221b0b1291117f8186ff4f975e99124063d3e56e310170df89c28de80