Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d528038169b242…

MALICIOUS

PDF

89.5 KB Created: 2021-04-02 01:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cedee52d51011be3dd4b645390c3a0c SHA-1: 5fe02268c2725890cda5369b11782bdc018d32fc SHA-256: 24d528038169b2421069b7226fea6430689acae3d5015f21d044e9fd283e24d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, many pointing to PDF files hosted on Weebly and other domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain metadata related to a technical handbook, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=2020+ashrae+fundamentals+handbook+si+pdf
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/nokaxesaku.pdf
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/xobekun_xilipaf_vaneruberomojed.pdf
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/6911160.pdf
    • http://mobufuwiwid.medianewsonline.com/revuriluvovonina.pdf
    • http://runaxok.iblogger.org/46799643796.pdf
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/2500974.pdf
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/71c79f8f.pdf
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/5776119.pdf
    • http://onlineeshop24.xyz/neil_gaiman_american_gods_free_do4lvs.pdf
    • http://tokio-2020.fun/55358297035a1zsw.pdf
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/7413944.pdf
    • http://ulekschool.online/fifty_shades_of_grey_2019_full_movie_download_filmywap6ir9n.pdf
    • http://detonicinitalia.website/nepazakojotuwexub9ko2v.pdf
    • http://fezufizibum.mypressonline.com/perexat.pdf
    • http://jesofafisozosa.iblogger.org/67089309341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luworizesupox/bowflex_sport_home_gym_replacement_parts.pdf
    • https://s3.amazonaws.com/fosalizuzu/joludilovalog.pdf
    • https://s3.amazonaws.com/piwanisaj/applicant_tracking_system_resume_template.pdf
    • https://s3.amazonaws.com/regovadeje/free_video_maker_software_for_pc_without_watermark.pdf
    • http://newemepakirid.myartsonline.com/bikixokanaxumageletusu.pdf
    • http://reruwok.rf.gd/34901812931.pdf
    • https://s3.amazonaws.com/nafibanefexex/execute_stored_proc_using_jdbctemplate.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_off00011aa6.bin
6ae49ed31a5ecc986dbd15abd7a5d8fd990d2a82c96412e978043a8e215a630b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 5664 bytes
font_01_sfnt_off00012db2.bin
08372a64e79aed6dc10b5ee461e93ab26dc5a9fc8988b8d7c19a8fdccdbde021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 12884 bytes

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