Malicious PDF — malware analysis report

Static analysis result for SHA-256 065b0a35bd09d8bd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 05:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01217ac4eb99683e252ac78b49598242 SHA-1: 6cbd3b9930e93835a9150a0d869f3bb6b74f3fbe SHA-256: 065b0a35bd09d8bd9c59d491469f233c5373e86830860df01be514f74ed63123
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious intent to redirect users.

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb51be3522---kasetud.pdf In PDF document text
    • http://propack-th.com/image/upload/File/39646119297.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/pixati.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jonoxovezalemeteperuwabup.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/rolubawiboxufa.pdfIn PDF document text
    • http://zaiger.ru/img/file/xotezulobuxosim.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/69263309464.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/24901601073.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/4527272094.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/67420256337.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rivamuxirowururazelod.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/biwojifijetegani.pdfIn PDF document text
    • http://dkind.net/userData/board/file/33823064298.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/mijitekozoz.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/31302077993.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/paminadejifi.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/58445564744.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091315373333.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/2864506108.pdfIn PDF document text
    • http://goldmustang.com/files/files/tabeguxumet.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rajowajinerunuvinulipox.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/9625524438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cardio+app+androidPDF 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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 17448 bytes
SHA-256: 49bca79b0803c68e6f40934a631f6f0e14ae974d9db3c4084449822cc6a88ee6
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 9972 bytes
SHA-256: 2450c393ad4d787fbafbb017ce9ac6df042967282d07e273d4420d2f706fdd9f
font_02_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1