Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bfeb8df74eeb85…

MALICIOUS

PDF

78.9 KB Created: 2021-05-03 21:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a126c92b9939a08706ccc9ad4c95ac04 SHA-1: 86e47f72bc514b5bb155fefde7fcd9899ec981b2 SHA-256: 21bfeb8df74eeb855212092c2bda35df1ad453f7932323cbbdc2eba83da00633
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 0.9990

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=how+to+set+time+timex+alarm+clock PDF link annotation
    • http://ru-dev.xyz/how_to_make_symmetrical_art_on_procreatel0ouw.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/igeV1Pr/lenejugowonaxatixanagasof.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/5ibLvhh/game_screen_recorder_android_4._4._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5fd61f6c4f72d.pdfIn PDF document text
    • http://artdebug.site/best_booster_seat_safety_ratings7j9m2.pdfIn PDF document text
    • http://wisecreditscore.info/mamedidarepokbc2w5.pdfIn PDF document text
    • http://immorta-cross1.club/android_secure_random_examplea95lx.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/2gdjbge/jebewutudiwet.pdfIn PDF document text
    • https://cdn.sqhk.co/fusunejevawu/jia49if/fomiku.pdfIn PDF document text
    • https://cdn.sqhk.co/javatepate/Wijjehc/circular_std_font_family_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_601b517966b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/kabolode/ChaUGjg/guided_reading_activity_25-_1_answer_key.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/73065497711se6i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffd55e4ad7fa.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/jdeEKhe/ragdoll_mod_fallout_4.pdfIn PDF document text
    • https://cdn.sqhk.co/bezugisav/jjgeQZD/50969198578.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/canon_pixma_mg2200_scanner_softwareabni6.pdfIn PDF document text
    • http://cosmosqrab.online/bass_guitar_method_freekwpjz.pdfIn PDF document text
    • http://naturmilans.fun/sesajememawokebamojurewakepkn3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/35908624311.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/comparing_fractions_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/74143757879.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/tomobuvavaduwotosutugadox.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/assamese_magh_bihu_photo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 4812 bytes
SHA-256: 11a55a8c24c23d0383bd7a085b0e813678ffc5bf568a54a35dbf96f8adeec730
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 11108 bytes
SHA-256: 73ead8088f158f970554c916c19a79629d4defa82ca481492f4f0c7a9c934a1d
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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