Malicious PDF — malware analysis report

Static analysis result for SHA-256 65645ddf6971d31a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 09:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ecb41c386a10502184a88160bfb09be6 SHA-1: 2a105542df57846ffd6f0fa51aaea4374e3cbf84 SHA-256: 65645ddf6971d31a525567d94a372013e8269e27c208df9e87e6e090b3bd4d8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is identified as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true destination or spread malicious links across many domains. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it's used for phishing or to redirect users to malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://salwangurugram.com/files/xirufuvitivagogofaradi.pdf In PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/nesafikabomifeg.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/37632215105.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/98895591902.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/80067099730.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/20076044401.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/9856986794.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/17066934902.pdfIn PDF document text
    • https://aromamarketing.md/img/files/72615062028.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/13374242120.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/rasixizavupodivox.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/zotivedi.pdfIn PDF document text
    • http://etre-belle.su/images/file/78138362446.pdfIn PDF document text
    • http://climtech.com/files/files/safepaxera.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2003939844.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/9835709512.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/31301727195.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb4264ded---tifepifi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa85cc3da8---gurizaze.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/22712054956.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/23242835967.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/lufuvisudulegopejeso.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75281474835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=boom+beach+42.37+mod+apkPDF link annotation
    • 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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 17552 bytes
SHA-256: c2a05ac11f14f4a2d1f2ccd4178d72e08e56e2c493ca97848bf4e125681050d5
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 10944 bytes
SHA-256: a0b81d87e2e93cf050297c3dff2a4468e7e915d8ff90f6117338665bd6dcb9b0