Malicious PDF — malware analysis report

Static analysis result for SHA-256 1403b4e66451f6ae…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 08:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9d0da0cc4348b5591fa50b5bb1ea90b SHA-1: 8083af3155bae972c74d99165b433933c660fca7 SHA-256: 1403b4e66451f6aefc87d94bc9e7228194f4821faa89ef92372115c713514a29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, including one pointing to 'smidgel.ru', suggesting it is used to redirect users to potentially malicious websites. The PDF's structure and numerous links indicate a link farm, likely intended to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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://smidgel.ru/uplcv?utm_term=long+tail+keyword+research+tool PDF link annotation
    • http://castudio.eu/userfiles/files/85344203288.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/78251531676.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/keluzuratokogimagalupan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f4acb42d---jokavararedipekoden.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/muxadometaxane.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/kizedozusozoketamu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sofapisilukiwidobixe.pdfIn PDF document text
    • http://eva.am/files/3e9a2048230ecf97.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b182cc0b7c---7213122427.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/89425651955.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912033253792264.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/pojimitabijovababerot.pdfIn PDF document text
    • http://islandpointfl.com/userimages/85110917038.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/vuvimiju.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4935352003.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/1928296872.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/33470610950.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/ganaxetum.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/fizabepenip.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pinodidulowosujukivesa.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/vumawitukoxuji.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vutekudozukuzi.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/56235623037.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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 17656 bytes
SHA-256: 0087ce070ef2b00df2eb69528f9950228915c42d0e282018d303efc0a7586406
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 10896 bytes
SHA-256: 19881ce2f6800580c7fd340c5e1b4bf5d9b3fb933863aa5c296219689f720345

Open this report in the interactive analyzer, or submit your own file for analysis.