Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43b6a1d58a0969…

MALICIOUS

PDF

75.6 KB Created: 2021-04-26 08:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1010e24285703f3ada36d6e271589d1e SHA-1: a9079cf70740291a719c08dd6d71ad25ad615bd9 SHA-256: 3c43b6a1d58a096919d409c9b7b14046e8b010295e633ae69578fa3f0286b5ef
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL observed is https://soxebez.ru/strik?utm_term=titulos+de+credito+tipicos+y+atipicos+guatemala, which is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=titulos+de+credito+tipicos+y+atipicos+guatemala PDF link annotation
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/muzeli-savadata-domivijuxotus.pdfIn PDF document text
    • http://unosital.space/drive_in_theater_los_angeles_opentz9t3.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/gedatiton.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/hhbojjo/scrapbook_daily_deals_sites.pdfIn PDF document text
    • http://train-home.ru/arms_and_space_race_cold_war_timelinewn6wp.pdfIn PDF document text
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/0d3f6f18.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/7203109.pdfIn PDF document text
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/6480953.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/jajjjjZ/56731816422.pdfIn PDF document text
    • http://bestunew.xyz/wopiduvadeseflwzo.pdfIn PDF document text
    • http://lg-supportteam.com/68204687804m63eu.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/CfRhhDl/fedupobusesogezor.pdfIn PDF document text
    • http://cardioactiveitalia.site/apple_app_store_for_android_apkgahiy.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef28c1f-f94b-43d4-9658-ea40dc35db58/97610066649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c37f112-0b46-4770-bd86-52ce93726eae/67924517819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7e0181-644f-4714-a8ab-efe0e9ecf3d7/33144287281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e98a61-f268-4cc5-8231-e0a64d0b272e/how_to_find_atomic_mass_of_first_20_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8153033-f29e-49ef-ab60-d88932dc1e51/confederacy_of_dunces_chapter_14.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/sig_sauer_p226_enhanced_elite_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842d6daa-fae8-458f-837b-edde28443737/2616809833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020b6592-1cae-416c-80cf-31e8cc22aa37/how_to_program_remote_for_older_genie_garage_door_opener.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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 5444 bytes
SHA-256: b48e56c554480a05a465be36b641b166fe04697673a1ea39815b9e6fee4144c8
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 11472 bytes
SHA-256: a6bff118b7eb98dc969cc3f247b8aef24af6645caf586bdd2e170b91370392dd