Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f2570089b96578…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 06:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 636c967a9ec93a0c79171af5ee61286e SHA-1: ad14471fbc06c6314c6066fc3a8c7f85c139bd7e SHA-256: 94f2570089b965782c03b333a355fb51808ea5d4d820f4c5ad73e360a115b85b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a lure to external sites, potentially for phishing or to download further payloads. The PDF structure and embedded links are characteristic of a link farm used to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=which+phone+is+best+for+rooting PDF link annotation
    • http://delfosventures.com/userfiles/files/15444170106.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109180703216073.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070554251486.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xibebewulikagijorujufa.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/lafozof.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/10504356323.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109050338405909.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/14425704814.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/towepe.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/fovutuvumubar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1cd334ce4---26954331031.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/dupifojolafuruv.pdfIn PDF document text
    • http://th-hl.com///upload/files/zafux.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/mavujewumat.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/lilovizivuxum.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/020135536075.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/befigudip.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/81475481598.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/kozujet.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/35315987990.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/47694243257.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/91651038148.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/140437164869.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/72632834966.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_off0000beaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAA 18992 bytes
SHA-256: ab7ff4347d879702763a2e852bc5f8ed2e408676a3e48684631df1750e40f1d5
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10684 bytes
SHA-256: 364aa5b6665fbd23a194aeb526b6435c60b9b74b9f1560c111d5ac8d22c62a0f

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