Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab40d2a9fef92af…

MALICIOUS

PDF

103.0 KB Created: 2021-03-29 03:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbaccad0398e4620f000d9962a0ec14f SHA-1: 2419a7f9b48940fc3a83eba28c08fea18cd2e333 SHA-256: 7ab40d2a9fef92afa34005dd5e1be0d5d15e59c7db3caec4a8c6a2b97f512096
336 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains an embedded script and numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body and heuristics indicate a social engineering lure, specifically a 'ClickFix' attack, instructing the user to execute a PowerShell command. This is supported by the 'SE_CLIPBOARD_COMMAND_LURE' and 'SE_LOLBIN_RUN_COMMAND' heuristics, and the embedded script's metadata mentions 'Windows powershell command list pdf'. The primary goal appears to be tricking the user into running a malicious PowerShell command, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 10

  • 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
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://seumenha.ru/strik?utm_term=windows+powershell+command+list+pdf
    • https://cdn.sqhk.co/nomazotesi/hfxhdOZ/90186641439.pdf
    • https://mawenevemubazu.weebly.com/uploads/1/3/4/4/134402841/796d9.pdf
    • http://smartradiobf.ru/go_tell_it_on_the_mountain_lyricsd9yea.pdf
    • http://hookup157.online/mutetavaneridonarozu5k2su.pdf
    • https://cdn.sqhk.co/sixitigoxeto/1iifwhj/78804743757.pdf
    • http://gordei2d.com/franchise_agreement_termination_templateyuvla.pdf
    • https://cdn.sqhk.co/rixutixim/Iia2ii2/the_best_to_do_list_app_2020.pdf
    • http://baltika-trans.ru/rexawuxetavefameqmppe.pdf
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/kizononulinavegowagi.pdf
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/3883542.pdf
    • http://gelchlen.fun/gumukigewexale6cjal.pdf
    • https://rotutipugav.weebly.com/uploads/1/3/4/7/134750083/vafazenusasiwu.pdf
    • https://cdn.sqhk.co/nomazotesi/h
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_58ab66ed64f64e14a53956ae9de152b3.pdf?index=true
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_96cfd21fb36047b18e6f488eb405e6df.pdf?index=true
    • https://s3.amazonaws.com/paropabaru/wuluvisaw.pdf
    • https://s3.amazonaws.com/woneketelak/lotus_travel_crib_fitted_sheet.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_38bb0a1764e7451b9717676429fae553.pdf?index=true
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_f3becd90290144f6babe665f3da59707.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000196ce.bin
7e02434b762ad347063ef0e5b0ebbef8fbc725d5c38b54938b0dc414135a853a		 pdf-embedded-script PDF raw stream script payload at offset 0x196CE 1592 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 shell/COM execution token(s).
font_00_sfnt_off000154e0.bin
0ecb2aa9dcc54ae69ec48160720cfabd0422b86405ea50629d2fcbf9dd17aa0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154E0 5500 bytes
font_01_sfnt_off00016781.bin
f07550e07272dc1e193c66dfa6c1bc8ceba64ffee3b9088b89c826f3357c5ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16781 11544 bytes

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