Malicious PDF — malware analysis report

Static analysis result for SHA-256 41072b7526af31e6…

MALICIOUS

PDF

77.5 KB Created: 2021-05-29 06:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f892cf16aa59d7419d44770cc8bca0b SHA-1: 7c73573131947f485c19304c95e4319c770952ba SHA-256: 41072b7526af31e609a85ab481586d9e6e4826472877d57304d69a40116ffbff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a PDF link farm. One of the primary external links points to a suspicious domain, 'kuzutuzo.ru', which is likely used to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/123?utm_term=coshh+assessment+form+template
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/nelofixawozu.pdf
    • https://cdn-cms.f-static.net/uploads/4369322/normal_606af50eb0ab7.pdf
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/5320429.pdf
    • https://cdn-cms.f-static.net/uploads/4425515/normal_6027b31ba6ec3.pdf
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6040186ad102b.pdf
    • https://biroputasore.weebly.com/uploads/1/3/4/7/134747039/tamezanu_ramepiv_duxasamibixemir_totijuj.pdf
    • https://cdn-cms.f-static.net/uploads/4447273/normal_602e131866444.pdf
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fcdaa8c841d2.pdf
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/dibaleb_gekodiximuredas.pdf
    • https://ladozazewuse.weebly.com/uploads/1/3/4/0/134095850/wukejelusujijov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/086dfb9c-d00c-40f8-9951-f4bbbbd5d5f4/the_whipping_boy_chapter_1_read_aloud.pdf
    • https://uploads.strikinglycdn.com/files/e71e0449-b277-4d10-9b41-d3c817cb0936/oracle_11g_sql_developer.bat_not_found.pdf
    • https://uploads.strikinglycdn.com/files/d9090887-e3dd-4d88-a3fa-f271a05401d2/73130034929.pdf
    • https://uploads.strikinglycdn.com/files/5baa93fd-f13e-4e2b-a34a-04f96a36874c/green_kinemaster_pro_apk_download_no_watermark_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/f5c989f4-2dcc-4f80-b0eb-d5fe05df050d/miller_welder_repair_parts.pdf
    • https://uploads.strikinglycdn.com/files/aa432b23-30d2-4df7-b7d4-0abb17702195/the_misbehavior_of_markets_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/cbcce508-58b5-4cab-9640-a1208b45359a/wuruwumabozubudobokofo.pdf
    • https://uploads.strikinglycdn.com/files/0958c502-f567-4055-980b-a5fb52b53d32/master_mantak_chia_youtube.pdf
    • https://uploads.strikinglycdn.com/files/61d16c06-003b-428a-b5a3-8257d8ebb728/miniature_english_bulldog_breeders_illinois.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b0.bin
92e8d20d47d2395b9a08ec2ff9f832d916d5812e42217ec3954d88f5ab81c711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5044 bytes
font_01_sfnt_off000103a9.bin
849a661d1a57a41d890519a1f3f3d287fa6f9d6c9ff68fc790dbd3ad96193a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10880 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.