Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1148e5944069d…

MALICIOUS

PDF

76.0 KB Created: 2021-02-20 16:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffcaaf197512ef5b0162e5fc77150dd0 SHA-1: 8dc0581d0ec88e574916548e31b957ddbb2032e5 SHA-256: f2d1148e5944069de61eb2c35cba1550bcd26707f144abc695843a74b9f82c11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic firings suggest this document is part of a larger campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=common+medical+spanish+words PDF link annotation
    • http://obsluzhivanie-kompyuterov.moscow/cambridge_analytica_scandaluf2xh.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/jujobigijugojuvoza.pdfIn PDF document text
    • http://dukepiweg.iblogger.org/bal_krishna_wallpaper_for_mobile.pdfIn PDF document text
    • http://skywonder.space/lemixegov9afq.pdfIn PDF document text
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/dotifa.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/5898353.pdfIn PDF document text
    • http://mybestchan.online/pcaob_auditing_standard_5qxyau.pdfIn PDF document text
    • http://xapepinozex.22web.org/leonardo_da_vinci_biography_reading_comprehension_worksheet.pdfIn PDF document text
    • http://subaxidubuju.22web.org/lugewesojoza.pdfIn PDF document text
    • https://biwaxosele.weebly.com/uploads/1/3/1/4/131437294/069f79ae2d2034e.pdfIn PDF document text
    • http://jushq.club/what_is_halls_theorysufz4.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/ruvurotazebix.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/e7ec524.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/mojaj.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/9126183.pdfIn PDF document text
    • http://50offstore.pro/9._snf_matematik_konu_anlatm_indcomlc.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/0wjd1jg/38090328455.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/2OMheEk/10780552623.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/TprFieK/baruseligidixapupe.pdfIn PDF document text
    • https://dosijikapok.weebly.com/uploads/1/3/2/6/132682778/2458973.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/hgcvtgf/are_eye_color_lenses_safe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajuzefob.rf.gd/79441541634.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 5308 bytes
SHA-256: dbae0c7f90deda910b004c400631ce713c0218c375958c0ac3579fde080612f9
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 11660 bytes
SHA-256: 9197c7389cfcd49754635d7eb55b4b6fb910dbe7506d5118612ccc42a082bb26

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