Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fefe503773590cd…

MALICIOUS

PDF

98.0 KB Created: 2021-04-15 11:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d5d182ac8fc6123018c2813f73e68ac SHA-1: 548a6000646fbd7dfe27a88b3c8b6723fe79a96f SHA-256: 8fefe503773590cd76ca29517aef7454a1fedbef4d1b5a99bacb5b1dfd6e9fab
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 0.9998

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 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://jacksth.ru/strik?utm_term=why+is+netgear+so+slow PDF link annotation
    • https://cdn.sqhk.co/kawurefeki/gjaui8p/93815823446.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/krichjg/vugupupop.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/jUwCidy/hover_1_allstar_hoverboard_and_go_kart.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/91012951272.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/mifawaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxubijutun.rf.gd/84451685292.pdfIn PDF document text
    • http://gigidubuvo.epizy.com/ridgid_10_inch_dual_bevel_sliding_compound_miter_saw.pdfIn PDF document text
    • http://saziwujezad.epizy.com/arnoldo_wald.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/emission_spectrum_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae18067b-e2f7-4a8c-a0d1-89b2398668f1/lutudogixov.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/78709874442.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/51212746110.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/93699701728.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/45660173663.pdfIn PDF document text
    • http://lenobarokolubik.epizy.com/wufeneza.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/third_party_logistics_contract_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf95753-484e-44a6-ba36-3d9ddf992e24/86762634560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1853e9bf-eab6-41ff-8763-0743eea3e7c3/whered_you_go_bernadette_reviews_rotten_tomatoes.pdfIn PDF document text
    • http://vawirir.atwebpages.com/63837327104.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_off00014276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 5156 bytes
SHA-256: 57fbc27cf757d9a6f02cc943117be9ccf3b7fdafa1821da8789f1904c384731e
font_01_sfnt_off00015419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15419 10996 bytes
SHA-256: 014268d124deff8d417c2547d9ea3cf5681cf12a10d72bdf73a12c79e147fd45

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