Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc13c9526c41b2…

MALICIOUS

PDF

72.9 KB Created: 2021-02-11 12:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5b0db48a05fcac5dc3c3c22a4737f9b2 SHA-1: de811a3b5c7e70346de5523bba50e14abd2d51df SHA-256: 87fc13c9526c41b20a93dbc24260a855155b66c84d0fceeaf2592cdedb1e2deb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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/123?utm_term=iroquois+and+algonquin+venn+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5fe7932c0c58d.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/hhpmumA/deathworm_ark_health.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/fixino.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ihnkgeS/zombie_gun_war_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5fe805b7c1594.pdfIn PDF document text
    • http://torevifij.iblogger.org/11624822566.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/7f2a25a.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/nebelatesikiluxo.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/twahbgi/7540157577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446264/normal_6009845f1c326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494663/normal_5ffdb4ed7a989.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gdjbheD/lutuvusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafevela.rf.gd/voucher_formativi_regione_toscana_under_40.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/christmas_gingerbread_house_template.pdfIn PDF document text
    • http://poxomagilunedi.epizy.com/integrated_reporting_capitals_acca.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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 5268 bytes
SHA-256: 9098ed1471778c4d436042b75e57f8c115ed34dccacdbc23f6a377566c59e34c
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 12728 bytes
SHA-256: ccc6c331f6ecb968151f693a74dde4dde4a930ba1f4539ac764a65dd0ee97dd7

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