Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a70c0954de3bc5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 10:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6e416025e5c945cb830bbee44f1e9e55 SHA-1: afbb55514f2f2165584e2af21da58c3113540ab7 SHA-256: 98a70c0954de3bc5bf0f8844ad3bf4266790259b196d7985e137bf06ef29cf4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=game+naruto+shippuden+android+apk PDF link annotation
    • https://sharjahcements.com/images/bulk_images/files/xazotaxidivipewosod.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nekutusijezavazomo.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/xevepuwotowajop.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210905_A7D5187703E78897.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/75208563494.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/bamotuvemibanud.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/mipamopabuwawujifirofip.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f3bfb312a6b42a881252bdf3ff2539e8/wojewevugu.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tulekaruzirokivoret.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/wikoridosotetokolimobe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/bifebizijinuz.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/nadiluvotuzukumigesef.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/94034234052.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/riziziwizogajudigol.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210907_9D6B13CEE3699379.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134265ce2655---lomigalufuk.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6924427642.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/vewexobamokekadobuzaza.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/bitujoj.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_off0000af09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF09 15596 bytes
SHA-256: 88f3d980ac0928b12b7d1e97c9d8d880dc24f3da33db0f8c9bebb88f425c4df2
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 10840 bytes
SHA-256: d8a87d691e11eb496e3e9b49ced52167d531a7821d066e0f2c67e636a65a211a

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