Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb56e94703a2653a…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 10:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e7724fd142d92bc3c99510398f51088 SHA-1: 14c837c360ce2b4f269e7b55e376618e5d3b2a3d SHA-256: cb56e94703a2653a0e8f5145d4d6b861dbcf010538a7c75f0032938b40aff41f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one prominent URL being 'https://bologen.ru/strik?utm_term=pluperfect+subjunctive+spanish+worksheet'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards an attempt to redirect users to potentially harmful websites.

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://bologen.ru/strik?utm_term=pluperfect+subjunctive+spanish+worksheet
    • https://cdn.sqhk.co/noradinez/ZyiihIJ/51801574149.pdf
    • https://cdn.sqhk.co/jigavozef/Bjhhjjh/wonuxuriwimitisuluwijonu.pdf
    • https://cdn.sqhk.co/dubikureta/hggcgcd/dollar_tree_stores_canada_inc.pdf
    • https://cdn.sqhk.co/fuvebopeweb/yiiCibZ/word_racer_yahoo_games.pdf
    • https://cdn.sqhk.co/muwunupudi/hgiiDig/alchemy_elixir_keyboard.pdf
    • https://cdn.sqhk.co/votiwixuduzo/ejjhjeV/movie_character_quiz_buzzfeed.pdf
    • https://cdn.sqhk.co/vefusujix/y0hjNZ2/66822168171.pdf
    • https://cdn.sqhk.co/xapewiwud/jcqJ7T2/meetme_hack_apk_download.pdf
    • https://cdn.sqhk.co/tamupoto/48hfkXI/47028066482.pdf
    • https://cdn.sqhk.co/jokawefezo/iCAhhia/sijedidapulidepuwudobo.pdf
    • https://cdn.sqhk.co/bedazume/uozieid/bittorrent_pro_onhax.pdf
    • https://cdn.sqhk.co/kurotevu/idU6Hog/40257261510.pdf
    • http://vajamerafimal.iblogger.org/email_signature_templates_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_8829f7b79e04436e90eb2323b6ed84a6.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_1c4e98ba0e194766b33649bec5886231.pdf?index=true
    • http://firuxafuxu.rf.gd/thousand_splendid_suns_summary_chapter_1.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_9a230af152e349e4bea39344a36d6415.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd4791b5-632a-4b03-963b-f2be449654d0/bodugumakufaganuxi.pdf
    • https://uploads.strikinglycdn.com/files/5bd251eb-2c31-4a9e-afac-3b2faef09caf/72739899119.pdf
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_a6ece5c3f49d484ebe992a8e3d17c612.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_4fd852537ca040a8adefe80e63d2f74c.pdf?index=true
    • 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_off0000dee9.bin
1ff37c62be8affab5d3e5a872f3f62b9c0ccd7e2dc4cafda54d21e9f98e25d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 5536 bytes
font_01_sfnt_off0000f1cc.bin
932feb8aa10542b825b63e4d3942b891eb9f5aab676f935e9c7d3b702535e57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 12352 bytes

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