Malicious PDF — malware analysis report

Static analysis result for SHA-256 231108057af08cae…

MALICIOUS

PDF

73.1 KB Created: 2021-03-08 09:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb32d705186bb42bcd43ef84c0f83717 SHA-1: b92eb4b12365782bc4482fdbdd7156d8518f2e96 SHA-256: 231108057af08caec41412d24d0ceb063ce5b162bb895ad1b1163866b969774b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, and one prominent link directly advertises a download for 'terminal emulator apk latest version'. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://midufefew.ru/wix?keyword=download+terminal+emulator+apk+latest+version
    • http://xebupado.mypressonline.com/grade_2_math_books_free_download.pdf
    • https://cdn.sqhk.co/wenewojufaj/2iaha0d/20454450019.pdf
    • https://cdn.sqhk.co/dosojegomugu/jBjhifq/history_of_the_world_part_1_quotes.pdf
    • https://cdn.sqhk.co/libobivole/xic1Xje/31693129552.pdf
    • https://cdn.sqhk.co/vemonososepa/RF28WZJ/gamefly_download_ps4.pdf
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/2762657.pdf
    • https://cdn.sqhk.co/gutinisiv/jagdL5z/54224431451.pdf
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/1512268.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/4341001.pdf
    • http://zatutajijiti.getenjoyment.net/inteligencia_emocional_2.0_epub.pdf
    • http://xulodol.mygamesonline.org/86808175640.pdf
    • https://cdn.sqhk.co/gukugifixija/jgcgjje/vikings_football_live_scores_stats_games_2019.pdf
    • http://jaralet.getenjoyment.net/zero_and_negative_exponents_worksheet.pdf
    • http://safijejog.mygamesonline.org/how_to_use_ridgid_wet_dry_vacuum.pdf
    • https://cdn.sqhk.co/fefowofuk/Lhiqiiy/xudobarudepijek.pdf
    • https://cdn.sqhk.co/wemojezuvegi/iiepjfS/fire_flying_type.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozoxub/arena_of_valor_switch_cross_platform.pdf
    • http://bidusibebawuz.onlinewebshop.net/what_is_geometric_sum.pdf
    • http://bifovigavij.myartsonline.com/honeywell_smart_thermostat_not_working.pdf
    • http://kemesuxaw.myartsonline.com/23642902398.pdf
    • https://s3.amazonaws.com/xukonakefules/express_bios_update.pdf
    • http://vorisenunajix.myartsonline.com/lurakakafosav.pdf
    • https://s3.amazonaws.com/tojabixefova/45495493223.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_off0000e186.bin
7285b6a9e48ad9acdb86d6f06df9de42d97ea48396b846b624fe2407acd7f6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 5320 bytes
font_01_sfnt_off0000f3a3.bin
d6043e701c3b4d3b31c41eb5a38a77fbb8bbeb920dce841b6e8b4ef573bf053d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10300 bytes

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