Malicious PDF — malware analysis report

Static analysis result for SHA-256 548e82789d151640…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 01:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aa363f044e4ea77e352f9789b97c0397 SHA-1: c897b94400fcfb7f3febf25e66794c3f9ef2d0e4 SHA-256: 548e82789d1516408a93ce1eead83c1b499a829eb1ed20164304554cd5cd2cf1
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to other PDFs, indicating a SEO spam or link-farming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=punctuation+guide+pdf PDF link annotation
    • http://streamsweets.com/loxivuponitotixerarudiyl0l1.pdfIn PDF document text
    • http://sivadozulov.iblogger.org/13110564839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fffe1af3e823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5fe14c86198c7.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/gU9jeia/legendary_warriors_in_mythology.pdfIn PDF document text
    • http://liketime.fun/lg_tromm_washer_oe_error_codeq7uru.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/xhbhfib/softball_questions_for_players.pdfIn PDF document text
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/wetalijoxuso_mazeler.pdfIn PDF document text
    • https://sejerujezoxovod.weebly.com/uploads/1/3/1/3/131398555/tofovebevemenareg.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/biayT7Q/round_clean_3d_app.pdfIn PDF document text
    • http://ighelperscenter.com/30412449814vgnh5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/amazon_fire_phone_update.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/terraform_ssh_bastion_host.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/17807738147.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/tanip.pdfIn PDF document text
    • http://sidunutisa.epizy.com/2010_lexus_es_350_blue_book_value.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5020 bytes
SHA-256: dfbf5728d1296982067c5bec80ecf3ed341525437fb2fdcc304afc06da3a65d3
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 11104 bytes
SHA-256: 3ccf5b5741bf00d06c41584f216ecc7a133e49afb9b31a76932a5a8bbeb15485

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