Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf98dc82e8f2ef…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 12:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303c1441c156857c50c6260be1fe7c02 SHA-1: d01e9f0f826a661a9fab7237e3ab8ad5f0296480 SHA-256: 8bcf98dc82e8f2efd378dfafbacb25355d7da0be4dc45022d5f67743494b4826
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique being Spearphishing Attachment due to the nature of PDF-based lures. No scripts were extracted, but the presence of external URIs points to a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=chaos+magician+deck+2020
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/mijixazu.pdf
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/delekigakoxal_fuveligom.pdf
    • http://joxitikoki.getenjoyment.net/jadev.pdf
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/158590.pdf
    • http://nituzovido.getenjoyment.net/gejuwudamefobe.pdf
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/demumorupegez-xinefimuwulev-wivolu-waxomajebedu.pdf
    • https://jubukukovojiri.weebly.com/uploads/1/3/5/3/135306868/8e27ad15cd.pdf
    • http://pikegupima.medianewsonline.com/onn_tv_codes_for_cox_remote.pdf
    • http://lebepufu.mypressonline.com/ap_human_geography_textbook_9th_grade.pdf
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/c0172872d38.pdf
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/sejiwaliz.pdf
    • http://pubofumoxo.scienceontheweb.net/chemistry_notes_for_neet_exam.pdf
    • http://wixosefimaba.scienceontheweb.net/how_to_record_a_fixed_asset_sale_in_quickbooks_desktop.pdf
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/bezolajazajusuro.pdf
    • https://lowezikalazana.weebly.com/uploads/1/3/0/9/130969016/kupiminizemaji_kirux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2140402-2caa-463e-b767-6a6b942c79d3/12537150388.pdf
    • https://uploads.strikinglycdn.com/files/a525e6af-3ff9-4cd7-a596-cca717301c3b/16910480835.pdf
    • https://uploads.strikinglycdn.com/files/cde1052f-2d5f-46c7-b19a-470239fa6a9d/76317643278.pdf
    • http://novogizeboje.myartsonline.com/i_am_the_purple_guy_lyrics_youtube.pdf
    • https://uploads.strikinglycdn.com/files/50873801-c6bd-49e0-ba3c-f4ca7aea9f40/varotovew.pdf
    • http://sukasorepej.rf.gd/vewufavepaziwitexodu.pdf
    • https://uploads.strikinglycdn.com/files/2f7e9d5a-9dda-4538-94b5-d17d175f1e66/nitufefitoxexipi.pdf
    • http://demajipo.rf.gd/modern_linux_administration.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97f.bin
50fc700a0f22f5c8404acc4fbaff52b44a2eef79419036cedf6d3b86ab30648e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 5468 bytes
font_01_sfnt_off00010bec.bin
f86873b111d7dc04ef338195e697bda6aea4eace594bea2d24a9defc4e414cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10860 bytes

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