Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8eba61b458ff30…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 22:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fb5526a25656cecba40a63ec2a59b46 SHA-1: 10212cab5eb9c41d452eb2330bed03669121e699 SHA-256: da8eba61b458ff308525a58f3a70eb2e6d68e065756f35c004d1a22b71a5f073
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, including one to 'xezojetit.ru', suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded content indicate it is likely part of a link farm or SEO poisoning campaign, aiming to trick users into downloading further malicious content.

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://xezojetit.ru/award?keyword=cphi+exhibitor+list+pdf
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/jotigabefu.pdf
    • https://cdn.sqhk.co/jemitaso/Mjjjiie/zenekutulogatimuxujol.pdf
    • https://cdn-cms.f-static.net/uploads/4464720/normal_602dceaa5cdda.pdf
    • https://cdn.sqhk.co/lewoxiguj/bjhjfii/save_earth_images_free_download.pdf
    • https://cdn.sqhk.co/kigaratak/bLAOgG6/lineage_2_revolution_class_change.pdf
    • https://cdn.sqhk.co/jepinixawide/fijihjl/wogusilem.pdf
    • https://cdn.sqhk.co/xidodaxu/hbhhthe/how_to_calculate_percentage_of_ignou_marksheet.pdf
    • https://cdn.sqhk.co/goponebegor/Pi11hdh/37215060687.pdf
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/347e1d4.pdf
    • https://cdn.sqhk.co/kusamika/ijghvjb/iced_green_tea_latte_recipe_without_matcha.pdf
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/votim.pdf
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/jeteki.pdf
    • http://wavapivanuf.scienceontheweb.net/oxford_dictionary_ebook.pdf
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/1c0a0619211.pdf
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5fede1cf44213.pdf
    • https://cdn.sqhk.co/fenazijeguk/Xhhhagd/petimosisulov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_90f7b39be3124a74aea466153764fff2.pdf?index=true
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_9f9f594dad5c45e285af5684c89c83d0.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_5b7b21aaf68c4b8cb7cd99f9d59197c9.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_f21848527c86409ab71c09bcbfe2451b.pdf?index=true
    • http://zagupijalixi.myartsonline.com/livros_de_candombl_gratis.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_off0000f049.bin
4f07ef1b4ad89f9941c0b307de3c9ffb8c96b8e00c09b3802ba722a538254d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 5032 bytes
font_01_sfnt_off0001015b.bin
12eacd5f4840e292e7035aff1223e41e6209330b16dd0edeadd136fc921d5533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11924 bytes

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