Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5b5e40be0415d1…

MALICIOUS

PDF

82.9 KB Created: 2021-10-11 08:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c61a76a1fb2f950c7b4cdd8fbee5adf4 SHA-1: c077084b73091277066fffa294b988f8ef2481a6 SHA-256: fb5b5e40be0415d1fd1db8d73e201ced3191e00a2ade551796b63f8ea87569ce
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a heuristic firing for a clipboard command execution lure, indicating an attempt to trick the user into running malicious commands. The document also contains numerous URLs, one of which is a redirector with a 'command prompt to reset password' UTM term, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=command+prompt+to+reset+password PDF link annotation
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/ladasepix.pdfIn PDF document text
    • http://mopron.ru/upload/files/60956314318.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_023646.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/kewedubu.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/48457491689.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/97600592657.pdfIn PDF document text
    • https://mmtours.si/uploads/komoropozisasaveputug.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/binep.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911210304.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/bijuteronage.pdfIn PDF document text
    • https://people11people.gr/uploads/File/53161193371.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1632022978.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/wufopavebu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/wuzet.pdfIn PDF document text
    • http://ternovykh.ru/content/file/36811907930.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/9644508578.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/xodusiwumidujo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/91184061186.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/2519079866.pdfIn PDF document text
    • https://telorgabus.com/contents/files/16396200442.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/56623474379.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/4109784664.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/xavugomitawij.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dabemunedulejififi.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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10532 bytes
SHA-256: 6894e18ade0d7f5dca35f8c0f9ea99b840a12e5ee4e7580603821c438b8d230a
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 18444 bytes
SHA-256: 87a082d2c81be8399269686c8a17443ef796315433ef2ed7f56ad0ffd38709e8