Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87685bd157c0809…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 18:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e96a48e99908f51bc5c18f531e16043 SHA-1: dfadcf7d3edbfa2bea8bfd65c062d3f7c8b2daca SHA-256: f87685bd157c08098138791033ac8fd048e9561cfa252a89b3310834d8c137a1
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs and exhibits characteristics of a link farm. Crucially, it includes heuristics indicating a lure for clipboard command execution and a password-protected archive handoff, suggesting it's designed to trick users into executing malicious commands or opening encrypted payloads. The presence of these social engineering tactics points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=android+enable+talkback PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb2d864f8---54706330176.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091407280373499.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908024725510131.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dotovunigunozamizid.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-14/20210914023755374620.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/pubadaxe.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/gubuzosesalora.pdfIn PDF document text
    • https://wmu24.ru/media/file/85035039685.pdfIn PDF document text
    • https://majubesar.org/contents/files/29811517867.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/wumasirelemezupuk.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bipinipozonalisikufixaj.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/95598214022.pdfIn PDF document text
    • https://mollis.rs/files/darixelezasuzajaporuzik.pdfIn PDF document text
    • https://biomisszio.hu/tmp/kesafuwudajonakuxoxiwexoj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bumit.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/vorokudirufipuropefovato.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/biduwes.pdfIn PDF document text
    • http://packturf.fr/files/96728290727.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/76688587341.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd97b0e51d---zujupapoki.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/98111723458.pdfIn PDF document text
    • http://dongphat.net/upload/files/27796554080.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 19044 bytes
SHA-256: 071d68907bcc4ea7a6cd6844e8217435dfd42885e4c22bc7e429149f9547a2ae
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 10408 bytes
SHA-256: 6272c5e1ce235504faa547a6ae5da488c0ec0d3f4c7a27f5dbd0f65acfdf37de
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1