Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8837539d63eef78…

MALICIOUS

PDF

72.6 KB Created: 2021-05-10 14:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b3efbb7324fa6a7f1239cf5c3383b988 SHA-1: 5767805ff5ea9b2c3dec23f11598bfb5843a61b4 SHA-256: d8837539d63eef786097379301ee9a1f38a0ed0751523ea1ad2488369fba8cb3
186 Risk Score

Malware Insights

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

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 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://dafemum.ru/strik?utm_term=the+lazy+man%2527s+guide+to+enlightenment+summary PDF link annotation
    • http://changely.club/nurazeivo15.pdfIn PDF document text
    • http://lamatokatov.22web.org/8846320792.pdfIn PDF document text
    • http://muvavezupat.22web.org/3340566897.pdfIn PDF document text
    • http://italysummer.space/13963953626xfp1q.pdfIn PDF document text
    • http://paksorond.xyz/gomulifafitig65vr.pdfIn PDF document text
    • http://antileqphh.site/pagufimagaxudantyjq.pdfIn PDF document text
    • http://mesimewipotaz.22web.org/solid_waste_management_text_book.pdfIn PDF document text
    • https://lavowoluxep.weebly.com/uploads/1/3/5/3/135388351/5527989.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/banivubitut-kefixewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_019ef2a012bd42d1ac19150c715a0f2d.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_610513a1926f4fe788bfb4b9c3a970cc.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_6ea236d5afe84b74a11adbd8041dff68.pdf?index=trueIn PDF document text
    • http://wojotefeva.rf.gd/erythropoiesis_stimulating_agents_guidelines.pdfIn PDF document text
    • http://sufutogikid.rf.gd/72489500400.pdfIn PDF document text
    • http://zemagej.rf.gd/interpreting_solubility_curves_worksheet_answer_key.pdfIn PDF document text
    • http://gikuzorasop.epizy.com/1312767630.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_0eecc6ebc42548ea95c737100720a03a.pdf?index=trueIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_4249b5ed3c294be78d1e9d3d45c3b9d2.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_87cb9757b6c94fbb88cb50d4a3f01f62.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_ac542e3f3d854db0bdddcb13d87a5d5b.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 5372 bytes
SHA-256: 601990a592c20d731f38517ad25fe18d950faedb1ca286617eaa9f023116f182
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 10920 bytes
SHA-256: 5cfb70f0f4540a8bd38f40477e647f6bdcc9ff23c3c576eb67f7c63eddce8ba1

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