Malicious PDF — malware analysis report

Static analysis result for SHA-256 3404b7a4bd0ea29d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 17:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f0cdd7c5eb47db22d698e3bd0cbb41 SHA-1: 219c76b18e8a4d56423b8bded597dd2f13511fb0 SHA-256: 3404b7a4bd0ea29db58c9bbe57344923b957b2a4775a6a6b9b2c757b098a0ef8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=bcom+llb+syllabus+pdf
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/katovagi.pdf
    • http://lamejix.scienceontheweb.net/kabinidagejuwafefuxa.pdf
    • http://xedeporib.medianewsonline.com/how_do_i_know_when_my_krups_waffle_maker_is_ready.pdf
    • https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/pedimojubudimudo.pdf
    • https://cdn.sqhk.co/rixakowu/h4igGie/sesafozanikaxunemut.pdf
    • https://moketotal.weebly.com/uploads/1/3/4/3/134315425/fobupati.pdf
    • https://nojokubovurob.weebly.com/uploads/1/3/1/6/131606526/dawijab.pdf
    • https://cdn.sqhk.co/razotefo/i35gjbA/difference_between_total_football_and_tiki_taka.pdf
    • http://folugomobok.getenjoyment.net/putusidoxovuf.pdf
    • https://cdn.sqhk.co/sogefuluf/hdBibVG/pokemon_tcg_online_codes_sell.pdf
    • https://melukibe.weebly.com/uploads/1/3/0/8/130873851/peluveg_ditusipori.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/2863507.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/pamibovaganab.pdf
    • https://cdn.sqhk.co/revowemerem/idgeHjc/pokemon_shuffle_mobile_friend_codes.pdf
    • http://wutugupim.iblogger.org/cheatbreaker_1._7.pdf
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/leluzixovejamu.pdf
    • https://cdn.sqhk.co/puberufibo/0lUmCBi/animation_funny_pics_gif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/doxifuba/an_inspector_calls_study_guide.pdf
    • http://tedonipevafipe.epizy.com/futilalosogiragekabiwed.pdf
    • https://s3.amazonaws.com/pujirageg/57094273488.pdf
    • https://s3.amazonaws.com/dosipive/92999819021.pdf
    • http://lekowezitodog.rf.gd/gilli_bambaram_goli_full_movie.pdf
    • http://tososite.onlinewebshop.net/41797647831.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87f.bin
4d421de38fb4938b5c3aae6ef3c873ebef4aa82d250ffdca16e74ac0663d1fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 5496 bytes
font_01_sfnt_off0000fb25.bin
3da35eeae5ffe51a4a1852197f0725b10ec6825ba7836ab3b0a29dde5a0a88b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 14564 bytes

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