Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d01e766839fea4…

MALICIOUS

PDF

71.8 KB Created: 2021-01-14 22:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8a7cef92f2edcdd160788a3a9294e103 SHA-1: 130daa69dbdb793f7fa8ef2d93827b0c6ef3c205 SHA-256: e3d01e766839fea44bb410186c45bbc67e433f8ffa019fd5809555dcd6f904d2
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic for a 'download button' lure further support the conclusion that this document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffking.ru/aws?utm_term=invitation+card+template+ai PDF link annotation
    • https://site-1166659.mozfiles.com/files/1166659/gedolofuzawafinojikud.pdfIn PDF document text
    • https://site-1178690.mozfiles.com/files/1178690/tank_battle_blitzkrieg.pdfIn PDF document text
    • https://site-1242655.mozfiles.com/files/1242655/new_york_times_spelling_bee_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f8df9ba7f998.pdfIn PDF document text
    • https://site-1179273.mozfiles.com/files/1179273/themes_powerpoint_2010_free.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/25f1b2a9.pdfIn PDF document text
    • https://site-1177423.mozfiles.com/files/1177423/relogevem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5fb5518a20fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fe9df022880a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450152/normal_5fe2a92695f33.pdfIn PDF document text
    • https://site-1083884.mozfiles.com/files/1083884/xiaomi_mi_9_android_10.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/jivuxo/kali_linux_light_2017_iso_file.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 4828 bytes
SHA-256: 9e0233ccdc0bfd225fc869f955c1d378889df32b24cda0f3f5a9c1179e2f969d
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10364 bytes
SHA-256: 5f4476ccee62fa74dc09c20430eedea13acf4ff5a388c3de421ee03e3de25f29
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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