Malicious PDF — malware analysis report

Static analysis result for SHA-256 4434204f44973f41…

MALICIOUS

PDF

68.1 KB Created: 2021-03-25 18:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 412285d7aeee5af6b8d8cee8bb370893 SHA-1: 74f3cb6f69324df4a7110a4e5522535cce6aa6b4 SHA-256: 4434204f44973f411eb76d94562592ba7cc1987ef9550ca99f6ae5edf9b0e68f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a lure related to 'shoofly pie reading check answers', indicating a potential phishing or malware distribution attempt. The presence of numerous external URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=shoofly+pie+reading+check+answers
    • https://cdn.sqhk.co/notokulojow/ieo2bQ9/alice_in_wonderland_text.pdf
    • https://cdn.sqhk.co/munuluxel/8xIPdlN/birds_flying_drawing_pictures.pdf
    • http://gelivebun.22web.org/rugokedidego.pdf
    • http://nozozofodedeza.iblogger.org/42062505852.pdf
    • https://cdn.sqhk.co/gejixoneku/cghibjh/boom_cards_speech_therapy_teletherapy.pdf
    • https://cdn.sqhk.co/nizufalagef/5Fgighu/rollercoaster_mania_game_free_download_for_pc.pdf
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/kuzixenoz.pdf
    • https://fazozojoxupu.weebly.com/uploads/1/3/1/1/131163788/rivoxomodedu.pdf
    • https://cdn.sqhk.co/lazujanaziri/edjaYAl/82514635799.pdf
    • http://wititabeg.22web.org/18295848740.pdf
    • http://vefobekusira.iblogger.org/dukomogejesosote.pdf
    • https://cdn.sqhk.co/tarolaser/ehgEhgd/76469051867.pdf
    • http://sitizinudex.getenjoyment.net/vitamix_costco_roadshow_canada.pdf
    • https://cdn.sqhk.co/gagupibi/yWjbjcm/daxipigozizuzuruba.pdf
    • http://rowowesofazov.medianewsonline.com/82848150696.pdf
    • https://cdn.sqhk.co/fajaleniwa/I1ihnsc/xakaruferudevodekilerif.pdf
    • https://cdn.sqhk.co/nurijodefa/BTThhii/teacher_planner_and_markbook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pojudezafal.rf.gd/18338651148.pdf
    • http://xekazaz.myartsonline.com/marvel_super_heroes_adventure_gamebook.pdf
    • http://giworutiw.myartsonline.com/96281971036.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_off0000cba7.bin
fab6ba61e5ada20970c8cf82c1f9c3c67a6fb3be199319eea1df0f1c2fc21d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 5776 bytes
font_01_sfnt_off0000df6a.bin
8e60e680b4f148cce408aced640dc1e99740a29229af3254ab60be63e1288128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 10056 bytes

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