Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4084c53aeb5bf3…

MALICIOUS

PDF

69.2 KB Created: 2021-03-28 00:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 904af966bd1b2a370ab957564c0daa9a SHA-1: e9eaeac772dbb7b6307bcb8a5fbb9193f4640e28 SHA-256: 8f4084c53aeb5bf3092715e923e7859fa076bd640ace1f5ed8f33abdc1680510
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=tetris+battle+rank+hack PDF link annotation
    • http://antonioita.fun/822582023953h4tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fcb64fed9a8e.pdfIn PDF document text
    • http://es50off.pro/vexuraj4cc9p.pdfIn PDF document text
    • http://car-test.pro/tapoziwilajudomitikotoguwd9md.pdfIn PDF document text
    • http://mklhhhh.space/speed_test_mac7st8c.pdfIn PDF document text
    • http://ekzo-fruit.ru/verbos_irregulares_mas_usados_en_ingles_presente_pasado_y_participiob32e7.pdfIn PDF document text
    • http://nickned.me/grammatica_tedesca6byq4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60365e419d0bc.pdfIn PDF document text
    • http://agentsecure.space/sibupuvotogs4yf3.pdfIn PDF document text
    • http://copyrightreports.com/how_warm_is_it_outside_right_nown4gz1.pdfIn PDF document text
    • http://93c836c0.linkbucks.comSTEPS:1In 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/8401a2e5-9b1f-47cc-bf0f-8bb1a3c34501/what_is_the_best_at_home_espresso_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18243a1a-3c6d-4907-ae01-8d2695de6341/xomesorujipiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f36f4e-23b2-4124-bd78-5856c1953749/oxford_maths_book_for_class_8_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c02c1b-5737-41c2-be60-382464e1742c/bose_universal_remote_control_code_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09733dd8-f9c5-41c1-acd9-a9e953dcaea5/which_hand_to_read_for_female_in_palmistry.pdfIn PDF document text
    • http://gekaxerawuzizuj.epizy.com/56441641005.pdfIn PDF document text
    • http://lazewimal.epizy.com/19522878196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f920d7b7-2b47-4af2-aea5-ddba020d2319/what_is_the_difference_between_gdp_and_national_incomeni.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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 5040 bytes
SHA-256: 3a0437276807926e8aab2891232cbd05256d7a80d887cfe0c1db0573d0665c65
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10908 bytes
SHA-256: 8fad768d4393b126ed339f33e65b9afb17efeb72f02a81880e21a959a047215a

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