Malicious PDF — malware analysis report

Static analysis result for SHA-256 645eb34ad30b57c3…

MALICIOUS

PDF

73.9 KB Created: 2021-02-01 12:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d70a204e86e0714f90739812758f81a SHA-1: 86d7976f4ee91500f1e0badf29939b4cfda28cbd SHA-256: 645eb34ad30b57c34be28a6d07988fa2d3081a81be87b548a43840e521ed67a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://leonvi.ru/123?utm_term=the+new+adventures+of+winnie+the+pooh+wiki PDF link annotation
    • https://cdn.sqhk.co/lagolipumepi/fhbjc5x/43834705297.pdfIn PDF document text
    • http://xakuneferufilew.iblogger.org/betegegezegusirojujisuw.pdfIn PDF document text
    • http://xivatididoxu.22web.org/maplestory_reboot_link_skill_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/donaxewon/ifjcji4/fukajo.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/powerpoint_template_for_designers_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sivofedexim/pl7Bkid/puzzle_joy_bubble_shooter_legend.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/ihp0Kjg/7114971160.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/cQRhbib/xewapikijubezemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavonuloruzofeb.rf.gd/defazomarogadirebavefupi.pdfIn PDF document text
    • http://deroselewem.epizy.com/codeigniter_email_template_library.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/renawifavugufatin.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/vande_mataram_song_free_in_tamil.pdfIn PDF document text
    • http://vetozidute.rf.gd/purevpn_openvpn_server_list.pdfIn PDF document text
    • http://nixefafezas.rf.gd/vukesativogikupaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/small_baby_telugu_song.pdfIn PDF document text
    • http://ketoxuxun.epizy.com/ssa_representative_payee_report_online.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/44214025285.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/casares_restaurant_guide.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 5264 bytes
SHA-256: 3e48c11761f35508d3e23e5062aa592f59d56f97070d1f1a0fcbef70884813b2
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10792 bytes
SHA-256: aa49c2bda2001bbe78aec58b2eb82b676bcca8d387d6fb42a9438013a44b98f7

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