Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90df3b82c0a72dc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 02:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b7ffc31b219c35b147f99820f238ead SHA-1: 5cbb17cf68bc4af333af6ddfc39d5c5d97d7015d SHA-256: b90df3b82c0a72dc57a48ec16dbd4a3ed06e2b5e02a6f033e6196c90b1e8430f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=lymphedema+massage+contraindications PDF link annotation
    • https://intrastorg.com/userfiles/file/36008620548.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kanuboba.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/85798817173.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/purenomumu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/12299939933.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/99051933137.pdfIn PDF document text
    • http://hainfelderteich.at/poromoxipujaxex.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/pizeja.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/65543327171.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gunelobazed.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/xovix.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/966326185.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/72063867765.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/40200374466.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/xufonupasififudupu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jobobokinegizugo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/55125493618.pdfIn PDF document text
    • https://defi128.com/userfiles/files/vanezepovenabubudelig.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/15117516050.pdfIn PDF document text
    • http://lulanjina.net/upload/files/77040784450.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/riwofazupavelunupesa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-20/20210920083724990696.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/18744690667.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/romonidufujumelem.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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 10988 bytes
SHA-256: 6efd3ea3e3b8d1d1a86e524922ff4d3bba30f5288565f505131e1ce96137198f
font_02_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 16140 bytes
SHA-256: 624d06944d9a1cfc2c1e7927a4c63e1df1b43dde6bb8d2170e35b658b326facb

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