Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10ca873f508a5a1…

MALICIOUS

PDF

76.3 KB Created: 2021-05-15 10:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 56bf0ba76141fa92fc05218f8249a5ee SHA-1: 9f2abecb243dd64274ba9f568fac52c5b4175522 SHA-256: e10ca873f508a5a19f85a9e5a82b9004bf176124d1f326b957e1f74a4700bc7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely for further exploitation or credential harvesting.

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 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.
  • 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://golowaki.ru/strik?utm_term=holman+rainbow+study+bible+nkjv PDF link annotation
    • http://pojokup.getenjoyment.net/pogebanuraj.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/70287111256.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/gijezuwanabarimufivamu.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/56181301059.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/ed336337-2555-47ea-ae71-db527bd2cf7d/used_lexus_es_350_for_sale_by_owner_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/pifaxorovumefekomajen.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/did_ivan_drago_cheat.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/pogolujepuv.pdfIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_9873aea922344a0da4c58cb13c823d32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/fuzalotodexoleba.pdfIn PDF document text
    • http://nenilezum.epizy.com/wakevejojuwitebewo.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/rawudifexofufizub.pdfIn PDF document text
    • http://gavekur.epizy.com/los_origenes_del_nacionalismo_mexicano_david_brading.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/information_about_pakistan_air_force_test.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/salvage_title_2010_camaro_ss_for_sale.pdfIn PDF document text
    • http://zazozipuse.rf.gd/english_text_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/rilevog.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/19274576660.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/hangouts_meet_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0bc30b-f824-4901-900e-ce3e1d2a5af5/nisulivewelujekorujasep.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_24867fbc040a49a2b3879a9cb4cb3264.pdf?index=trueIn 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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5468 bytes
SHA-256: 61d6c7e47ad4eeb3ab60472e3e7c91a9951d94747963d9e2132f17486586c9a3
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 11020 bytes
SHA-256: cf56d4515da6fb046305a195342a9790f7dc9d637877c3940daa4ed71c0ac177

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