Malicious PDF — malware analysis report

Static analysis result for SHA-256 950f511cdbc75515…

MALICIOUS

PDF

70.5 KB Created: 2021-03-21 01:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c273d3cfc0e6bb678f7b6f4371e549c SHA-1: 3214f885ba513b17e70e20f88b419592438e2ea2 SHA-256: 950f511cdbc7551559962ee93b2ae51c6280a8026f7ce142f4893a2b8a081827
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/award?keyword=fundamental+accounting+principles+20th+edition+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fd0dc3bf201b.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/62043887475.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/fosamixekikej-pomadejexev-zoxuzinisimeta.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/051527675301.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/tiboxidevasolev.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/482770828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_5fef43b14d928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6042da7398eb4.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/83004389883.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/4818465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_603e08b52cfce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6017ce19695d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f4ae24-5a9e-4a64-848e-37a73cf46f6e/66230532841.pdfIn PDF document text
    • http://zinipaxafuzonik.rf.gd/23616084755.pdfIn PDF document text
    • http://nixutatafodozof.epizy.com/antigona_zig_zag.pdfIn PDF document text
    • http://lipunigofajeza.epizy.com/wavidedudunigosajudojowu.pdfIn PDF document text
    • http://jibogifimot.epizy.com/honorbound_rep_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273ee194-d2a4-4956-ba17-1b9bf6e5fdf2/vokagomigum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ad125a-7228-4dcc-a5ca-d7fcb9860cce/lopuvoxamev.pdfIn PDF document text
    • http://pibodowisolizi.epizy.com/95169205809.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 5796 bytes
SHA-256: 88785aa63a27c0b8f0ec2f1aa5c56cc15efce6895656eb4186d59f2fb0cb4375
font_01_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 10816 bytes
SHA-256: b4d562a482aea59408fd268ec1b1bb8b131d282127e706f81e7ffcf9128dfde3

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