Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e4cc510995db55…

MALICIOUS

PDF

84.7 KB Created: 2020-11-16 23:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ce948c5c861431001d761c6bff4dc75 SHA-1: 208ddce452fa05b7256d341f7c4618530344b535 SHA-256: 85e4cc510995db552b978029ad2b50d66d7f5b95f8e90aa5cfd2855107f71959
156 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 5

  • 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.
  • 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://traffnew.ru/123?utm_term=mimic+statue+farm+terraria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f9de9760f631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fb25208d82ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5fa09be2c697a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5f9a02424b0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f88ae0708fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f9e893a7aaee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f98c5e4c6f86.pdfIn PDF document text
    • https://pativezakuzorad.weebly.com/uploads/1/3/4/2/134266084/gisimaw.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8fbc91aec6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e770b84-03b4-433e-ad16-df824548e828/longaberger_baskets_value_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3975298-74c5-423d-803e-d1d3d5b54c74/gogugigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07856594-0a5f-4e14-96a6-c05b58383c3f/ejercicios_de_probabilidad_binomial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2e1dbf-3c70-4b69-ae96-d399ae947621/contabilidad_bancaria_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b961e6-ef55-4f26-aad0-86bdc700f74d/hb_sports_discount_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e662c0-387a-4c8f-b737-9f4fb331be1f/magapel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 5000 bytes
SHA-256: 914021bb49e46946a9664c56614b2729832ad903a63017318f6ba2e0196eff1e
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 9932 bytes
SHA-256: d28c97675aa9bd5d1acff5f1abf991f7ac507d6d1de3380255060e7c50cab711
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16060 bytes
SHA-256: 3a2bb6651a5ad642813d1e324805fe83a688734d44fd23e014c0665a2602df32

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