Malicious PDF — malware analysis report

Static analysis result for SHA-256 065106a1707e5a02…

MALICIOUS

PDF

111.3 KB Created: 2021-05-07 20:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2135e441b7887d9e5937aa70d08ea003 SHA-1: 5f5d0a081a8c1c8469c582a0e79c950ae922bf10 SHA-256: 065106a1707e5a02eb5c852140d70ad5f817c396ea688cd31979dadb8dd3b09a
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 0.9998

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://dafemum.ru/strik?utm_term=does+emdr+really+work PDF link annotation
    • https://cdn.sqhk.co/damukowabij/hhhciOW/35105783659.pdfIn PDF document text
    • http://watasanu.iblogger.org/picsart_gold_apk_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/bpjeigN/star_wars_final_order_stormtrooper_nerf_gun.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/g2yhcBT/lajeza.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/fhc60IK/82786746171.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/aptana_studio_3_tutorial.pdfIn PDF document text
    • http://pejefekivuvofun.iblogger.org/zoxova.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/hhheXrZ/fejaneregajufikezanip.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/geBfABX/5873669348.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/meludav/how_to_read_financial_statements_warren_buffett.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_30e58d85c7db4546998b1424f103cf51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/sozukutigotalinunibosu.pdfIn PDF document text
    • http://mobukug.myartsonline.com/33796632924.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/little_prince_book_report.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_9fe81127ac5749f1a24aa122f102d711.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_cdeed0d9214b42b5807b1842ea7fc269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/vibawopigoromokesof.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/4a_s_detailed_lesson_plan_in_english.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_09f2240f4faf410da8f4a813110ca11a.pdf?index=trueIn 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_off00017487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17487 5228 bytes
SHA-256: 8223656a16291824287e1fdee45505b36e2faa0a9fa773f69ff474c67ae43e40
font_01_sfnt_off00018651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18651 12200 bytes
SHA-256: 8e7d89bc0eb7198865182460f0b434bd8865fa0e205a587f69a03cf71be971f9

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