Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27bd13d5f50f4db…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 17:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8b400d1de53abb6bb2bd8c0305b28dc SHA-1: 754f0b4fcc8b4a6d0746c77e677202fb94e98fee SHA-256: d27bd13d5f50f4db917ee52611c395faa4bee071455d001e1ab23dfe0f675ccf
126 Risk Score

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 0.9996

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://lozipotod.ru/123?utm_term=free+fire+advanced+server+apk+obb+18 PDF link annotation
    • https://cdn.sqhk.co/vusutazomaga/hdfhehM/6292965380.pdfIn PDF document text
    • http://marketop.club/5e_riposte_sneak_attackuagrp.pdfIn PDF document text
    • http://myfoxing.online/kanadur9lqco.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/3Rjcjii/overtime_form_in_excel.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/xezizedebuzawegirisipuwag.pdfIn PDF document text
    • http://allfreebets.ru/heparin_bridge_to_warfarin_guidelines8ysiu.pdfIn PDF document text
    • http://meetchambre.xyz/who_brought_christianity_to_south_africaaipms.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/hjYr9gi/dead_zombie_attack_sniper_killer_3d_last_survivors.pdfIn PDF document text
    • http://pojokup.getenjoyment.net/dagewesajufij.pdfIn PDF document text
    • http://supernefritroller.xyz/suruxavupizoruborwgj2d.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/oibELji/21271414633.pdfIn PDF document text
    • http://quickstore.pro/24044785389dznqv.pdfIn PDF document text
    • http://takaweri.mywebcommunity.org/ketogenic_girl_meal_plan.pdfIn PDF document text
    • http://appeal-ig.com/48373221994c4gs5.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/xozeb/12786272653.pdfIn PDF document text
    • http://lagixilutami.rf.gd/performance_appraisal_review_phrases_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/bon_jovi_live_concert_free.pdfIn PDF document text
    • http://mijumepalus.rf.gd/59179946109.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/math_worksheets_for_8th_graders_with_answers.pdfIn PDF document text
    • http://wowadepadon.rf.gd/border_officer_game.pdfIn PDF document text
    • http://zajunevoza.epizy.com/free_subtraction_worksheets_without_regrouping.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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5584 bytes
SHA-256: 3e57a37b4c13840fb8b886d356084387073aef1d7b25e05f87ef08244b507bfd
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 11528 bytes
SHA-256: 96e4525e3054ff8d14f45992f18be94d4ae473f7f1a488a96392f65f74733c98

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