Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ad8812500df5df…

MALICIOUS

PDF

79.8 KB Created: 2021-02-22 13:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ac3deb5ab63b0b7f7c778bc59d8323d SHA-1: 9e2382fdd07a7e7513ec66350fab8fb6edc7323d SHA-256: 47ad8812500df5dfdfa2a487e3b1c8ca1f236a4a9c6f010e19b9564e31371d6f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=britax+infant+car+seat+reviews PDF link annotation
    • http://zisesiso.22web.org/request_meeting_via_email_template.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/5313321.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/pamulukesevitaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fd6f78ca50da.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/fuvogonugedaje.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/kitorezeluresosuroso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_6024c55403e9f.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/4ad861e9636822.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/janewekumisabe_nezofumiridixe_betugobanu.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/zaniretijajidaxim.pdfIn PDF document text
    • https://nubajegi.weebly.com/uploads/1/3/0/8/130814178/ca0f1a079a.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/40232cfc7.pdfIn PDF document text
    • http://jewagep.22web.org/the_things_they_carried_chapter_16_what_is_the_effect_of_notes.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/6008673.pdfIn PDF document text
    • http://albatros-trans.ru/xapejixexavaq03so.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobununebufipu.rf.gd/desh_bhakti_geet_marathi.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_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 5112 bytes
SHA-256: 0edf764694dd3741fe0bea9634d311b05764dcd4db94546257a4f7f87815936a
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10580 bytes
SHA-256: a595d641f10b3c74f8d4cf5bfc45634a399b4b29e30e81171277535abbdcfcec

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