Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38ee8f0949f27d6…

MALICIOUS

PDF

124.7 KB Created: 2021-03-08 08:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4443c3f0c05ae8f70087f2335a138a5a SHA-1: 16dd0174533320b85708e3df881ad77a72fa755e SHA-256: c38ee8f0949f27d6854f831ea71ba0f5dcbf9e5ef85b8d0871a91d8330bd8f5d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to generate traffic to potentially malicious or spammy sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=chemistry+of+life+worksheet+answers PDF link annotation
    • http://rating-bookmaker.ru/are_employee_stock_options_worth_it4e8r0.pdfIn PDF document text
    • http://milanbeach.fun/manedagefelaqrek7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_5fd630dd93dc0.pdfIn PDF document text
    • http://jadebey-x.com/best_android_game_emulator_for_windows42qdm.pdfIn PDF document text
    • http://banquepopulaire-fr.org/lenezubedavutz16j.pdfIn PDF document text
    • http://bitjoms.xyz/25783240043i1hi1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_603e842d5e0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_6025ff0514afc.pdfIn PDF document text
    • http://savodaveb.22web.org/what_to_eat_for_breakfast_no_grains.pdfIn PDF document text
    • http://shoop-fm.ru/noromevamozelesiw3g9r.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/84e1cc43-68c8-4b36-8873-567ecdfe52b1/88082644222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eced976-853c-40b8-a80c-88cbbb6731a9/11307899398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428ae018-4376-41ee-97d9-a8c6f84c82f1/senafad.pdfIn PDF document text
    • http://felepav.epizy.com/bromination_and_debromination_of_cholesterol_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d163bb8-f6d6-45c9-b942-111243929f82/baby_trend_expedition_double_jogger_stroller_accessories.pdfIn PDF document text
    • http://muxuvulumikabu.epizy.com/where_to_drop_clothes_off_for_donation_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704ab14d-7032-44cb-9636-b0456b68276e/yy50qt-6_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0766cbce-21ef-4235-ae9c-b9271ae1896d/jam_bluetooth_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66be914-4c4c-4b2a-8f10-d0667ebeda19/dijiwakunefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce7908a-694d-413a-9aaf-1cb201494bf5/lobunud.pdfIn PDF document text
    • http://mevexunimapo.epizy.com/sifef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c0a34a-3829-4fad-a483-29a6897e30e6/dikizatafenulijemig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aad97ec-8732-409d-b260-120dc5482535/how_to_put_arris_gateway_into_bridge_mode.pdfIn PDF document text
    • http://vidabovon.epizy.com/taxarofegilarovafovelap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001946c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1946C 5168 bytes
SHA-256: 3b97272ae4523c6f5c83365692bc6da625d928e34711f67610629cf57f0c49d2
font_01_sfnt_off0001a5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5E4 11572 bytes
SHA-256: 5394b89673672e7eea94d8b9924111199797b1d360371a3e681830cd8667314e
font_02_sfnt_off0001cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD98 16680 bytes
SHA-256: a3749207e0ba73d07a70f64f31fe4a1b5e0f6dc7662ad08991381497e1219368