Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d75c883cee00e3d…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 07:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6b84295651553d1d1ab50a95d030f8fe SHA-1: 3b7a85156d2c99f3ef1ffe1f27603238406c3bde SHA-256: 8d75c883cee00e3da4f3fd59d6548c2562304b861d86d51a203e26dffe01fd4e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the heuristic firings and the nature of the embedded links suggest a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/strik?utm_term=aprender+ingles+con+canciones+subtituladas+gratis In PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/4382795.pdfIn PDF document text
    • http://myluckybet.xyz/char_broil_infrared_fryer_manuallaln7.pdfIn PDF document text
    • http://classkaod.ru/47333877977akkdt.pdfIn PDF document text
    • http://instapodarok365.site/silasalomvfvi.pdfIn PDF document text
    • http://gufutaca1.xyz/tinus3q99m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5ff12218e682a.pdfIn PDF document text
    • http://card2card-perevod24.site/singing_lessons_app_offlinesh6pm.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/cie3Iie/air_nailer_hammer_not_returning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_5ff4dd972091a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fc7abcc4aaa8.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/hibC7mT/96040717220.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/2081992.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/ieidqhd/73173884949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_602a92b8c2f0d.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/hjjcieM/fedisumamadeluvajufet.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/wemazun/fenonusujefes.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5368 bytes
SHA-256: 13f23b946964cc874fe9bcea0e10bc3de454a5ece210b1de275cfa138832d3e8
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 12076 bytes
SHA-256: b041fc84e16b50f4ef0e81873fac7431e74ee28b20fdea0216123ecddd742d15
font_02_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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