Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac4553f54ffae5f…

MALICIOUS

PDF

78.7 KB Created: 2021-06-03 18:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 17ad704fc2c0a90cdaf9ce6b0c5059e1 SHA-1: 588b377464256b1ba554f7035a407bbec9242ba5 SHA-256: cac4553f54ffae5f06d5fc4e603fe18df1bf047b5320f7bb51a72e632646b537
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=canon+eos+5d+mark+3+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474988/normal_5fdbd4f7876ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417809/normal_5ffa1a0cc5b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5ff208e5ee3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_601255cb11b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ffd6e4c294b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_601ba6e08758b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144428598/xujoxalutisalamul.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144527694/bulewarazukebimolob.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/temadewepa.pdfIn PDF document text
    • http://jevibufile.pbworks.com/w/file/fetch/144543120/zuneguzoso.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144459822/nomao_minimalistic_camera_iphone.pdfIn PDF document text
    • http://togusan.pbworks.com/f/wazujeboreboligixosafu.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/66375531734.pdfIn PDF document text
    • http://garigor.pbworks.com/f/libro_sep_espaol_6_grado.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/what_material_are_alex_and_ani_bracelets_made_of.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/can_we_convert_psd_to_cdr.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/61353930300.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/adobe_premiere_pro_cs3_setup.exe_free_download_64_bit.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/10902170871.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144561651/61152002625.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5228 bytes
SHA-256: 6533147e154c15b3f1c3381af8557285ffdd33e5455e0d0a22804eb85eaa3e1c
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 12056 bytes
SHA-256: 93e802ddac3bcc389dc83c94cd2be9b8d0292bc15fcea6cb65771e801a090e9b

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