Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e16502e7f70f76f…

MALICIOUS

PDF

73.2 KB Created: 2021-02-19 02:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c1b9103395aa60d822ad5f39c98b3a57 SHA-1: 9447edde1cc10c2c484e311e4e804603f11c0c11 SHA-256: 5e16502e7f70f76feb129333aaadb95533d7af101d36f5d012cc1d9a9d4fefa1
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious redirector links and suspicious embedded links pointing to potentially harmful domains. The ML classifier strongly supports a malicious verdict. The embedded links likely serve to redirect users to phishing or malware hosting sites, a common tactic for initial access via spearphishing attachments.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://crophysi.ru/strik?utm_term=why+does+my+lg+dishwasher+not+turn+on In PDF document text
    • http://blancly.xyz/87798786472uccmu.pdfIn PDF document text
    • http://pocki.top/55102289440x3d6.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/1847982.pdfIn PDF document text
    • http://mon-compte-cmb.best/how_do_i_find_the_code_for_my_lg_tv67ics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_601fff789fd94.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/roxupukedujofevekibissshu.pdfIn PDF document text
    • http://momentikshop.space/776730724sw1w3.pdfIn PDF document text
    • http://italysummer.space/balveer_natak_ringtone21p6e.pdfIn PDF document text
    • http://inter-kalinka.ru/solucion_salina_isotonica4go6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_601e5cce02b47.pdfIn PDF document text
    • http://tomandbxof.site/44238984080rdkz.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/bigikusupukuponor.pdfIn PDF document text
    • https://wamexololizod.weebly.com/uploads/1/3/2/7/132712163/7bcb3bed17f6.pdfIn PDF document text
    • http://cashfree.store/bodyguard_season_1_complete0vn3k.pdfIn PDF document text
    • http://mrshadow.net/engineering_economy_7th_edition_leland_blank_and_anthony_tarquin_solution_manualn16ri.pdfIn PDF document text
    • http://importants.space/supercapacitor_vs_batteryg5csd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 5448 bytes
SHA-256: 60326dad64c5845a154498e06264c0b17caa395f18f73a2a62ff256e7924d604
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10376 bytes
SHA-256: 4874f5555856a7873642ccb012247da4377a1d72ddfc92ce1ef13f65f1345398

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