Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb76b83698d66ca…

MALICIOUS

PDF

70.3 KB Created: 2021-03-12 08:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 639e6444d9208ed84c12c3ccbda57aa7 SHA-1: d318a2a2b094db686bc8d9e7251be6d6b5d83108 SHA-256: 5cb76b83698d66ca0dc0bf559eae881534f63f0b38803b6caa6163d3d0915b5b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to facilitate initial access.

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://kuzutuzo.ru/strik?utm_term=aci+method+of+concrete+mix+design+example PDF link annotation
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/c3609210262b9.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/nourishing_traditions_pregnancy_diet.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/ed044058a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_602ad162a6de9.pdfIn PDF document text
    • https://vitudanowule.weebly.com/uploads/1/3/5/3/135341415/9479262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_6020b4b907923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_5fdba0271496c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_602f0f2e31d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6043c1ab66b23.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/fidjgjf/dark_dungeons_rpg_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/WyZchjs/radio_italia_live_2019_scaletta.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/zitanepijozeb-ribiz.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/jxoCHxg/sync_icloud_calendar_with_android_caldav.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/8a3395bc-1e47-4b63-9322-6846c01b3b18/sat_test_dates_and_locations_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9978c3-1461-4295-8e1a-981b74a8be14/ccna_voice_exam_fees_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fd13ad-114f-4001-83a9-f749cfd8dc41/99099093966.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/assignment_agreement_template_canada.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/75552599325.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/antivirus_app_2018_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/82279601449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d260ca99-a261-4fc9-94cd-5a048556e365/tavixugekalususod.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 5628 bytes
SHA-256: 9c01e8e65315669d6eca2fd6d4a091ad9d5ebbe5a28982714d901bd2728fcc56
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10496 bytes
SHA-256: 383657edad77d9d4843ca4be5ad93e11dfa01725a4910ead195f0826df1c7559

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