Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14459783d8e4448…

MALICIOUS

PDF

77.0 KB Created: 2020-12-18 08:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 496e1e89243f851bab68c9b483df8014 SHA-1: d814082f7669e525e2f5ea1d29fbe3b711763995 SHA-256: b14459783d8e4448c000b0b5541001d15b88c9c6189ec13fd9ce5259f881cd56
234 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body contains text that explicitly instructs the user to copy and paste content into a shell context, a common social engineering tactic to trick users into executing malicious commands. This behavior aligns with the 'Windows Command Shell' technique, and the overall nature of the file suggests it is delivered as a 'Spearphishing Attachment'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=kushala+daora+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fce06dcc4453.pdfIn PDF document text
    • https://uploads.strIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/detective_conan_episodes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/migobamowovujalidute.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/sanjay_dutt_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387afb59-9d1e-4c4a-8375-782ee7be283e/rundll32_printui.dll_printuientry_dl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7feeaaf-e2fa-4a76-84c3-3fb87251694e/73251763129.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/ir_spectroscopy_chemguide.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/16c8f810-4a13-4d99-8b8f-c6e51a440c8c/godetijat.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/zifute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684c9984-bf38-42b2-9ef2-5715665b594c/zagenogev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdef4cbc819f1cf49d6ef4/1606283084955/51743912888.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dfc5405d5340f3296f29/t/5fc6f3cb1d106d256bb5ea3f/1606874059867/powalufutiripiriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae653c0-1ad4-4789-a727-ae4e3e5d32fb/pojojixedogaguwadiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7a0606-2e76-4536-8e8e-5514aead3a15/bigg_boss_11_12th_january_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5056 bytes
SHA-256: 291dd91a8dfc3981cc286ee5733327342229d14a6e6f06b6e19685cd64552d0f
font_02_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 10032 bytes
SHA-256: 7762909a30d444c6b2365e8659871d6794c837d2e60beb832d5327d3d6373a22
font_03_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 16296 bytes
SHA-256: 7583f185eb70c834dbef86defd32e43bd4e629a4cef938d499cd396a3901c101