Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fadc14fc30f748…

MALICIOUS

PDF

68.6 KB Created: 2021-03-11 05:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8e508e3f16734def82cf20325021530b SHA-1: c9f419eea2fd360fc11bada028a1be38c19fa5ee SHA-256: c1fadc14fc30f748a3be2b05f0a659d9adaeadf234e7e5f6eeb8c66df9855edb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://gimoguvi.ru/award?keyword=lonely+planet+russian+phrasebook+dictionary+pdf PDF link annotation
    • https://wapilumavazari.weebly.com/uploads/1/3/4/4/134446451/voxov.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jjiduje/bloodsport_2020_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/1jbjaig/xinusugutikavilasul.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/76731973621.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/valisoper.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ajajc2U/japan_auto_spare_parts_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_5fe9ad0047b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_60130d4ec8329.pdfIn PDF document text
    • https://fitetavixanara.weebly.com/uploads/1/3/4/7/134721375/1d6f99.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/7363229.pdfIn PDF document text
    • http://depusapo.mypressonline.com/92789582747.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/jgfieij/roriwosew.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/hhfh9hF/2961547003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_6034964bc315b.pdfIn PDF document text
    • https://givurubikuz.weebly.com/uploads/1/3/1/4/131482907/rulaxanakife.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/mapajedepi.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/nipulapelezov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_601d555828313.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/0c041992-a095-4754-8470-c2836f031aec/20329149528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db5d65c-c62c-4425-95a5-c61ba81fd115/the_breadwinner_questions.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/stephen_kings_it_movie_full_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf36a6e-88e1-4792-94a5-06992a99ac2e/lonav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39964cba-2dba-45b9-8554-22d990a0b00d/serizejudizimul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460ed793-513f-4cd8-8bf8-43bcbab494d6/software_development_engineer_in_test_resume.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 5492 bytes
SHA-256: d743624627643374bb963b5970d0210e9ed0d7e5bd2641164d02846c8d177822
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 10420 bytes
SHA-256: 954385ece8ea2c1050f549edb13edbfbe19820db35f816d03400ded02459b541