Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8e4c9c25073fd9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 22:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0590a81a5bcf6550af21bbc507b1048a SHA-1: 7b0270f4dc0785bdedf7a67d5a32cf722e103cc1 SHA-256: aa8e4c9c25073fd94f6406ec8ba5752629f39026b78ba7b006e55c9a2386a730
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate a 'ClickFix' social engineering attack, where the document instructs the user to copy and paste content into a terminal, likely to execute a malicious payload. The presence of numerous disposable domains and link farms further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/wix?keyword=mhw+error+code+50382-mw1
    • http://manybigs.space/excel_2013_formulas_cheat_sheetx848j.pdf
    • http://liketime.online/40950019361s7ca7.pdf
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fc922ffceffb.pdf
    • http://zimagobotas.22web.org/creative_sound_blaster_x-fi_software_windows_10.pdf
    • https://cdn.sqhk.co/pijajawopoji/iqhdBuA/the_son_of_zeus_scene_full_movie.pdf
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/movusemimaber-movija.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_602a8350133fa.pdf
    • http://nelomevasusuf.22web.org/gumewexibilinatalazeval.pdf
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/zutovogo.pdf
    • https://cdn.sqhk.co/zosurinipin/gdjjggq/neximojojedizomoj.pdf
    • http://zanartcc.net/regegilomdx3w.pdf
    • http://raicen.com/pixerireneslq12.pdf
    • http://kaboliwup.mypressonline.com/caucasian_chalk_circle_stylistic_devices.pdf
    • https://guleritep.weebly.com/uploads/1/3/1/3/131383493/9476104.pdf
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6061d66e96756.pdf
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/dadekezekaz.pdf
    • http://gakagebir.mypressonline.com/msi_970a_g43_cmos_jumper.pdf
    • https://cdn-cms.f-static.net/uploads/4416151/normal_603ab98094754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibopinalilabaj.onlinewebshop.net/ascii_table_in_java.pdf
    • http://jisijuvod.myartsonline.com/data_science_career_opportunities.pdf
    • http://tajazenu.rf.gd/lagu_bakuto_sengen_daigunder.pdf
    • http://wewabegig.rf.gd/18785159619.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_off0000f191.bin
a2a4253708a5f7bead74c1dc5b90c7c9486c8d14ecc6ec8f0c3287c784b4f6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5696 bytes
font_01_sfnt_off000104f7.bin
ef2e5d9c4769df5b670263a0d72eaa30193b0fd3727b775e360048ca315af63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 11628 bytes

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