Malicious PDF — malware analysis report

Static analysis result for SHA-256 d343929d3b679471…

MALICIOUS

PDF

73.4 KB Created: 2021-02-17 00:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3870d5b0d1121cf00aae6567db2efafd SHA-1: 39b16d3f14df9bb5e575c37ec6ebfb442faaec48 SHA-256: d343929d3b6794717855dbe7dff0c37decac9ad975e3a20f386cf62f63f6feb0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Nvidia geforce gtx 970 review' and 'wkhtmltopdf', indicating a potential lure to disguise malicious links. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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
  • 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.
  • 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://jacksth.ru/123?utm_term=nvidia+geforce+gtx+970+review PDF link annotation
    • http://amst-watch-v1.club/jotadajuvirdn1cj.pdfIn PDF document text
    • http://idealica-itufficiale.website/mekokebexoxx9r8.pdfIn PDF document text
    • http://gomosivuniku.22web.org/gukuwebadozaratuwofopetos.pdfIn PDF document text
    • http://salonapp.xyz/72335869017y0mmv.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/fT1jad2/3888669683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_600de5185a9c6.pdfIn PDF document text
    • http://dress-russia.ru/67301666735zab9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_60257a111e80d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5feaf0e16aa21.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/iAo251u/mugeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5ff7084de5ef2.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/jezisosododavudago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_6014fb6dbc65d.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/a63745283.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/6162504.pdfIn PDF document text
    • https://pogiwubuwafax.weebly.com/uploads/1/3/0/7/130775808/9891988.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
    • http://gagutaxu.rf.gd/466427959.pdfIn PDF document text
    • http://votoromuw.epizy.com/black_hd_wallpaper_for_android_1920x1080.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 5228 bytes
SHA-256: f131294bb344456012a474a20d3a6a2dc3d412c133d0d6983e0a30623e62ae77
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10964 bytes
SHA-256: f89c379a81dd37be7ed94c44dfe3d949aa1150b41a190c0a6fb15932ba309108
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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