Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b56de91a5cfcade…

MALICIOUS

PDF

77.8 KB Created: 2021-02-14 18:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df9fd47f0468c9a6f16e8c8a4959f807 SHA-1: 01b6be2a04c3f1c5bb42f1b5675b012b9fe8ae6d SHA-256: 3b56de91a5cfcade9549936b08804d896407832812b076301a64a2a574f28784
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content, such as the 'ampere apk full version' mentioned in one URL. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/wb?keyword=ampere%20apk%20full%20version PDF link annotation
    • http://unityfree.xyz/wagafulabogogesudawudobai29fc.pdfIn PDF document text
    • http://timelessdecorum.com/4091799937q0v7l.pdfIn PDF document text
    • http://lagujegivupani.22web.org/cheat_engine_android_remote_ip.pdfIn PDF document text
    • http://rat-red.space/autonics_pr12-_4dnhl9tp.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/261637137971xsv.pdfIn PDF document text
    • http://remontlegko.info/11627795828sarzi.pdfIn PDF document text
    • http://discovljzg.fun/spiderman_movie_song7gvll.pdfIn PDF document text
    • http://draiwenstore.online/7356770918nwfle.pdfIn PDF document text
    • http://goldenframecollision.com/adding_decimals_worksheet_tenthst868l.pdfIn PDF document text
    • http://moresukko.ru/zamifebanokedp0erm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigivixegaxun.epizy.com/yooka_laylee_impossible_lair_achievement_guide.pdfIn PDF document text
    • http://gixopuvap.rf.gd/ullathai_allitha_tamil_songs_masstamilan.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/dante_s_inferno_ps3_guide.pdfIn PDF document text
    • http://dojeranorered.epizy.com/bossa_nova_guitar_solo.pdfIn PDF document text
    • http://berowajadodi.epizy.com/the_nielsen_total_audience_report_q4_2018.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5160 bytes
SHA-256: e0fd2f33dea78d61714b8aadc54fc91fef5f9ce7024ff02ce859e2dce7d2ad07
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10792 bytes
SHA-256: 3dd1c35c51ceedf81fa9eddcc39e1a605fc9dae8acc98bf79909af5e62e31edb
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 16068 bytes
SHA-256: 3b1167557c0500c78008053c404847a906c4d495ef15adec583fc97e76626070

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