Malicious PDF — malware analysis report

Static analysis result for SHA-256 b404253c3349bacb…

MALICIOUS

PDF

63.5 KB Created: 2021-03-01 12:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 47364f0400abb19e7eff1ca25cfa2d57 SHA-1: d5de8a68600f8086ec42d6018b052c8e2c241257 SHA-256: b404253c3349bacb3fb67baecfc9a827797c1ef816985175a3afc037e53b0f11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://resalured.ru/strik?utm_term=why+is+my+dell+battery+light+flashing+orange PDF link annotation
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/7804607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366044/normal_5fdfc5ca890d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601f01ed25390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe9ec7e5915d.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/muxivafogeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fdc429446c3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389366/normal_5ff4cd8dddaa8.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/nukeritilakarezet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390328/normal_5fde51fa93a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fe9425b8dab1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufabilo.rf.gd/cessna_182q_service_manual.pdfIn PDF document text
    • http://mabagojovas.epizy.com/nerukuwata.pdfIn PDF document text
    • http://gevalej.epizy.com/woxolidewibejulovezelej.pdfIn PDF document text
    • http://pubadaxakefiwi.rf.gd/73430267641.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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 5576 bytes
SHA-256: 256efb8f159da393833b51b4c074ec96a68b4b0b5ab8f967e165e5783f5b9445
font_01_sfnt_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 9816 bytes
SHA-256: c2056562635ec08e86bac8f04f97d14b994945da99fd9f3fcba7a049ee522699

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