Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3536828db7c9b2a…

MALICIOUS

PDF

70.0 KB Created: 2021-03-15 23:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac5bd5a921d1df4ed0c7e51ae9c69b17 SHA-1: d5764e4c621bc0b330ee2a6119a5f8851ae67062 SHA-256: c3536828db7c9b2a45acdf4fba3c0c16ff4022767ab0c5d6bc1f7869b33b06e1
186 Risk Score

Malware Insights

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

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 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://bologen.ru/123?utm_term=businessman+ringtones+dialogues PDF link annotation
    • https://cdn.sqhk.co/gogerazina/Dsidsz6/champions_manager_mobasaka_2020_new_football_game.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/jHNheU0/ardougne_diary_osrs_guide.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/96967373640.pdfIn PDF document text
    • http://sweetmeet.online/kowagilejn8xq.pdfIn PDF document text
    • https://pazudafodimaje.weebly.com/uploads/1/3/0/7/130776249/nexotikuvat.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_pair_photive_bluetooth_headphones.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/9549040.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/iHLgiTi/97988224679.pdfIn PDF document text
    • http://ulekschool.online/what_were_the_elements_of_the_treaty_of_fort_laramiexkb9b.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/mA5gj2d/tolileb.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/G1dtEgj/36017165521.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/82139360554.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/9NDoLih/bottle_green_jumper_school.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/consumer_credit_risk_management.pdfIn PDF document text
    • http://liwojabegeje.iblogger.org/how_many_calories_in_dunkin_donuts_frozen_coffee.pdfIn PDF document text
    • http://siloxolilalapas.22web.org/48001367259.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/gedabapuvidipefoxejx50me.pdfIn PDF document text
    • http://verifybadgehelp.com/93002061096ebuhv.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/HRY8zif/91362432935.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/fopikeroxukitomq45no.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratagewenik.epizy.com/67148007412.pdfIn PDF document text
    • http://batogejupimole.rf.gd/crazy_frog_ding_ding_ringtone_free.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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 5192 bytes
SHA-256: 49d9871c10a5144665335bde27d5ad57133665c329c4ebec1d6f1815c722823d
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10600 bytes
SHA-256: 92bd9cae9f7e337f71a1f0909506193334acd1bab8141b1681da851f4016c86b

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