Malicious PDF — malware analysis report

Static analysis result for SHA-256 4218263b948c2557…

MALICIOUS

PDF

78.0 KB Created: 2021-01-28 16:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb4391e9d8c4a1117a8c437eda690769 SHA-1: c6f9d068d42290970fc526614a7fdf45cf08cb64 SHA-256: 4218263b948c2557b7f64cad96e6e41b4afe1a9757a6a205633cb1d89eed1ac0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The presence of a 'Download Now' lure and a keyword-related title further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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.
  • 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://seumenha.ru/wb?keyword=download%20grow%20zombies%20mod%20apk PDF link annotation
    • http://menbp.online/tebibirufug89zvv.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/Jhe5ibq/icee_maker_target.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/X6vhfhc/viral_video_of_man_drinking_cranberry_juice.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/lorev.pdfIn PDF document text
    • http://testrun.ru/55815926733vddgr.pdfIn PDF document text
    • http://specialsale.info/xuzutukafabe4a9w8.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/gibud.pdfIn PDF document text
    • http://heretythere.site/nuloviliwesuluwuvazatusebimvej.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/jfK0Fjd/minecraft_pixel_art_tutorial_website.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/watusebakun.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/Vzji8gf/save_earth_save_us_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hrjgjOc/table_tennis_rules_and_regulations_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/rzShe43/nunosigilevipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pujirageg/72905604698.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/android_wear_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/sikuf.pdfIn PDF document text
    • http://bojonovaja.rf.gd/pepov.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5332 bytes
SHA-256: a4048300cdcd36ae80fff0088713f8776fed073cadc81f32f46ca220b3594633
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 11116 bytes
SHA-256: 87fe700d204f4bb38e217def9794c8f98e4991b2db4087ba0fa9ab387fc378e5
font_02_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16116 bytes
SHA-256: e96a39929a3ee4368c789de6c023a80270c635750b084e4808b8bf3da701a45f
font_03_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60