Malicious PDF — malware analysis report

Static analysis result for SHA-256 38eefc199edd2c11…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 04:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: be03805da1b632cc864c88c6627c4370 SHA-1: 256d0985bd02452fd68d7a66d09ab270f26f7f4f SHA-256: 38eefc199edd2c11973a3683641f19fdb0b6963c2168b44f59e2e56aed19c874
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=asus+rt-ac68u+repeater+mode+no+internet PDF link annotation
    • https://cdn.sqhk.co/guzunilepin/jjFYDKa/65963384489.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/djeDRij/edge_lighting_s9_not_working_whatsapp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_604ae321425cc.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/1RKjjhf/kadenakomukitepa.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/pomoxaxotevit.pdfIn PDF document text
    • https://cdn.sqhk.co/foxenikap/jeicida/custom_snackbar_android_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd33e3e7e53a.pdfIn PDF document text
    • https://cdn.sqhk.co/simumufij/yjjc9ia/wurer.pdfIn PDF document text
    • http://soluzixod.66ghz.com/gusunikawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_6011e2b21bfc4.pdfIn PDF document text
    • https://cdn.sqhk.co/risosejuze/niEyggu/performing_artist_meaning_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_65ebd295197340db9ffd4a6946edb49c.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_2468eea42d1a45f9a9d1fc013faf8a77.pdf?index=trueIn PDF document text
    • http://wunipowozat.rf.gd/mejor_diccionario_frances_espaol_online.pdfIn PDF document text
    • http://wewodato.epizy.com/fish_identification_book.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/prvi_svetski_rat_knjiga.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/vefaju.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/defonixoliparajexo.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_7cab19b5cd28401882ad15becc632f25.pdf?index=trueIn 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5556 bytes
SHA-256: 680d7b5442b74204738506e807d2c43d3957785c2658b7ab92b4876f5aa83e7e
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10876 bytes
SHA-256: 953daccba7685b9e1a0f455c4c0f57da59473daa55990cefca913669b8a0a3a5

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