Malicious PDF — malware analysis report

Static analysis result for SHA-256 948a913a574811bf…

MALICIOUS

PDF

78.7 KB Created: 2021-02-13 07:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2bb933a1293dc0f0437f9b49ee60bcd4 SHA-1: dece9052e075c14f423e478c8e4e033dcf6c6c50 SHA-256: 948a913a574811bfbeec10e573199d05a1389e6b5811483f2ada33a223afb37d
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or dynamic DNS services, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=community+circle+questions+distance+learning PDF link annotation
    • http://electrumwallet.buzz/blank_ballot_paper_template5guzd.pdfIn PDF document text
    • http://idealica-ituficiale.website/15904692991vexea.pdfIn PDF document text
    • http://detonic-italy.website/208170527138yav1.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/33e0d18168a023.pdfIn PDF document text
    • https://veregatuvodomos.weebly.com/uploads/1/3/3/9/133997599/530582.pdfIn PDF document text
    • http://fresh-ita.fun/kifawakoka46iqf.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/8843404.pdfIn PDF document text
    • http://pannochki-art.com/23839079609uwdsc.pdfIn PDF document text
    • http://reduslim-buy.site/67150228297xk3jw.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/tesezimesutuveju.pdfIn PDF document text
    • http://fonomujolatuv.22web.org/outlook_dark_mode_android_app.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/3c5e8.pdfIn PDF document text
    • http://topshops.website/paxumoruzesavoduwukonizu0euw.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/319061.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/punosuj.pdfIn PDF document text
    • http://blockhcain.host/jeromavakunu89w5g.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/1067546.pdfIn PDF document text
    • http://bbflowers.net/11612729452f44v6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusakarazixano.epizy.com/79270628542.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 5392 bytes
SHA-256: 00dde6c8d4deb223b548741ef0cd3ea15586d6fb52f952beab4033c2b17dbb6e
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 10208 bytes
SHA-256: 7760c01c48d7cd50fefebaa6487516e04e8f8b0fcb5e41c4dee43b92051f3a7b

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