Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a78f1c26778295c…

MALICIOUS

PDF

80.8 KB Created: 2021-01-31 01:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ab5c65a20c11744b625acce950c569ca SHA-1: e8283c5bc2977bb6126e605d5a7c1dab260a6b9b SHA-256: 3a78f1c26778295c7a94c2701b401f2a8ab11e1cd0de43a03e7cdeaed944be11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=almost+a+hero+guide+best+team PDF link annotation
    • http://kipivejezijab.iblogger.org/common_core_multiplication_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/KSyjcje/85467900810.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/bajasepi.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/iYhfuwf/bakaxunod.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/bhdIghN/kigajupagagobig.pdfIn PDF document text
    • http://misstourist.info/pasogamafasivozexabuk9yxd.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/ejeNjgb/90849249279.pdfIn PDF document text
    • http://steelsho1.club/myteamcare_texas_techuilxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/loranoduzuja/free_music_sheets_with_letters.pdfIn PDF document text
    • http://gukewaxubi.epizy.com/bournemouth_tourist_map.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/libunatupujagos.pdfIn PDF document text
    • http://wilunimexa.epizy.com/denosoxem.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/vuwuxozafobot.pdfIn PDF document text
    • http://bixikaw.epizy.com/portal_hypertension_guidelines.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/australian_indigenous_health_information.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/game_bleach_vs_naruto_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/happy_birthday_song_naa_songs.pdfIn PDF document text
    • http://dumoripusino.epizy.com/junikavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/57029927570.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5144 bytes
SHA-256: fd29b9a79dff2d9172d491c3c0bd905785e480da833bc63697ba0e7216cd5a69
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10064 bytes
SHA-256: 3ca16bd73edbd79eb137c7501286aca92d1cba167d830c0cd4b99abc0d7cafe8
font_02_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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