Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b38e580124f974f…

MALICIOUS

PDF

62.7 KB Created: 2021-02-06 18:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4745840d81364b060882c2823d32a314 SHA-1: d890550d769becef32f254327339424ebbfe401e SHA-256: 6b38e580124f974f2771543bf28fae9ebb1d3d8f0a1c8e67a439e61d90a078b2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to facilitate the download of a second-stage payload.

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://jottigo.ru/wb?keyword=magisterium%202%20pdf%20ita%20gratis PDF link annotation
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/jonanivev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_60038e415a300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_6007cab5b9559.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/jhIhd2I/free_online_meme_generator_no_watermark.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/7300884.pdfIn PDF document text
    • http://gevixadita.22web.org/73632692695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fe0044b809f6.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Zhijbmo/bixefaxilodenisoxosoduven.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/huDigsE/minutoxetijuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/RAeghjD/ruvuluvajavatite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5ff86b4d46fa5.pdfIn PDF document text
    • http://piredvizhnik.com/66356819324np6xs.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/9575997.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/4ba0454.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/bgjjbjc/fairy_tale_high_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 5464 bytes
SHA-256: 032eb1733eb42e0ea2f34c05b7ca02884a24f345e0be06818bc8945a6ace0d30
font_01_sfnt_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 10632 bytes
SHA-256: beb3faafb307aeb4c5d2b14e0637f89247ec75a155fceea9a88a080c4c4d6f0c

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