Malicious PDF — malware analysis report

Static analysis result for SHA-256 a080d7a5434c9251…

MALICIOUS

PDF

90.1 KB Created: 2021-01-12 22:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9c0cf9a2876bed9a2d5deb30860929b6 SHA-1: 889800e410b30eb196c543cfa28db70cb556d559 SHA-256: a080d7a5434c9251d757a3bc64470a2068d411fd37c70cc63d8d27e78f524feb
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The presence of a visual download button and the ML classifier output further support a malicious intent. The document likely serves as a lure to direct users to malicious sites, potentially for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=skyrim+se+dual+sheath+redux+install In PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/49528280366.pdfIn PDF document text
    • https://site-1168046.mozfiles.com/files/1168046/baby_shark_costume_party_city.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fbcf6016cbc3.pdfIn PDF document text
    • https://site-1176507.mozfiles.com/files/1176507/revenge_of_the_ninja_full_movie_1983_download.pdfIn PDF document text
    • https://site-1228032.mozfiles.com/files/1228032/html_form_checkbox_radio_button.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/0ojhggc/xosiwi.pdfIn PDF document text
    • https://site-1175317.mozfiles.com/files/1175317/timarebelalapugav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_5fa6078441a7c.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/jbRhhoE/julurave.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/8907741.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/tulakubirik.pdfIn PDF document text
    • https://site-1198047.mozfiles.com/files/1198047/dune_2000_series_review.pdfIn PDF document text
    • https://site-1227746.mozfiles.com/files/1227746/37844110515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/zifuwuwet.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/jirat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 5404 bytes
SHA-256: 59feb1d8a961757d835307434a84c465b1981e56584ac754355de2275a63f7a7
font_01_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 11088 bytes
SHA-256: cb12deb750805bed289434468f3a15f2cef2c954c519e02faf06777374c191df
font_02_sfnt_off000145cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CB 16160 bytes
SHA-256: d2619b9a2a7dec81ecbbf05c496b7f5492bc56d5eefc2cd48183daaf603cb6ac

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