Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a9b8eb43904914…

MALICIOUS

PDF

79.3 KB Created: 2021-02-26 18:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80ae1d1dbeb66e931e26ea10711931dd SHA-1: e5cf2de397aa5d4e5847f49f2672c343e7c0f3db SHA-256: 65a9b8eb43904914e98b3b40391c5fd7f2c9c4255cb659bc4b798a8173df7386
226 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/wb?keyword=literature%20and%20the%20writing%20process%2011th%20edition%20table%20of%20contents PDF link annotation
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/180586.pdfIn PDF document text
    • http://morj.space/sabaxodazixubinupohvofp.pdfIn PDF document text
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/kabuletolexu_lonotemuwuj.pdfIn PDF document text
    • http://wejewirivi.iblogger.org/81500815082.pdfIn PDF document text
    • http://spencermcman.us/what_size_are_shark_vacuum_attachments7xo4q.pdfIn PDF document text
    • http://osthondroz.com/antiepileptic_drugs_ppt_freetid6c.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/52cfaf6c898d.pdfIn PDF document text
    • http://lnstagram-support.live/55877743369zzc2y.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/mozodatowinozif.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/02b8af.pdfIn PDF document text
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/gamet.pdfIn PDF document text
    • http://bnl-jobs.com/sabrina_graphic_novel_downloadc0fcw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witekibumu.rf.gd/87676776415.pdfIn PDF document text
    • http://xotujulenibol.epizy.com/abaqus_theory_manual_6._13.pdfIn PDF document text
    • http://guziruxasa.epizy.com/popekenutavenadin.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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5640 bytes
SHA-256: 530a15bc6e44e81d978b79a4451cfceb6382be576e350a56363ecf4f989f9613
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 11296 bytes
SHA-256: 805d1ce9fd0575c2ef54408d600e514fb4cbaa0e7cf65a15469b5cef0039be64

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