Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c62b2114d567ed…

MALICIOUS

PDF

67.4 KB Created: 2021-03-21 09:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c4ea12f1fca65b9926530a7430ddbd9 SHA-1: e78b982e059d990db470876aa40211a47ae47876 SHA-256: 62c62b2114d567ed8d3c58356d5d2e2dfcbaaac3dc3f2208d06876fa96645a43
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate a high likelihood of it being used to deliver a secondary payload or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/123?utm_term=assalamualaikum+photo+free PDF link annotation
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/cbe5c.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/4gcFfie/98288784262.pdfIn PDF document text
    • https://cdn.sqhk.co/fusevesapime/gi6gcjb/83401730006.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/jhfSBha/90951391637.pdfIn PDF document text
    • http://intereriia.com/86244743243xdev4.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/865124.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/UzgjrUv/83574860533.pdfIn PDF document text
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/galenonuvokekununo.pdfIn PDF document text
    • http://asia.kiwi/scroll_template_word_freeux8wx.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/4152111.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/39268.pdfIn PDF document text
    • https://cdn.sqhk.co/netomivoku/jgcha8X/nokitowekuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/haQjeif/us_missile_defense_system_in_action.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/vfhfgeT/superhero_ringtones_for_phone_download.pdfIn PDF document text
    • https://ginarelerojafu.weebly.com/uploads/1/3/2/8/132814261/wotonemison_wilonaper_jizajo.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/9c73f5a7-3047-4373-b1e7-a96de74de9c1/how_to_connect_xbox_360_controller_to_dolphin_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2606b615-6bc8-4ea0-910f-38ccdc4d4b72/29842294666.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_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 5192 bytes
SHA-256: 10bd11e20a1ed3b322dc95461dc11bc1c2971f628cdbcf4901c8cf08528cf84b
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 9520 bytes
SHA-256: 72edd00989c16a6258ede71406a665549e581528957801c599bea6baaa85a3ee

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