Malicious PDF — malware analysis report

Static analysis result for SHA-256 624e95fc1018bf46…

MALICIOUS

PDF

76.6 KB Created: 2021-02-21 22:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64c530383a29878d9e3d259b5a7b6a06 SHA-1: 33d6d1c3988a327fbe5b6a5f861760f5efc62a71 SHA-256: 624e95fc1018bf46c5aa69689d9c1f0ddbbbd266e855eb82caca0a2076ea7ff0
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://druttle.ru/123?utm_term=what+can+a+diabetic+eat+at+jersey+mike%2527s PDF link annotation
    • https://cdn.sqhk.co/dudexobexine/giYIJhh/tewalifasawebefij.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/tesiboxux.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/ihabefx/87937023925.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/7d375b.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/jbMgd9h/directv_guide_button_not_working.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/584c389.pdfIn PDF document text
    • http://itverys.space/spellbound_korean_movie_eng_subg7smw.pdfIn PDF document text
    • http://chunyoo.com/highway_to_hell_album_acdcswi8p.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/hdMywge/my_virtual_pet_shop_free_online_game.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/46432295357kyw5y.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/6392560.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/99ab6b7785eb4.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/fasodut-fewolim-jivewogamivu-soworasivik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matujuluji.epizy.com/aluminio_caracteristicas_y_propiedades.pdfIn PDF document text
    • http://pasazaxara.rf.gd/zutudatatotawunajubot.pdfIn PDF document text
    • http://vigevelo.rf.gd/casio_fx_991_es_plus_user_manual.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5576 bytes
SHA-256: 14fc8506c03e462dec5da349c8c5044dae33e03a7faf7f6351a6638729462f43
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10428 bytes
SHA-256: 714fdee8000c4eac499544ba0e9a96f995a675edf33d19cfde8270b3456daf0f