Malicious PDF — malware analysis report

Static analysis result for SHA-256 87039ce0a5b96563…

MALICIOUS

PDF

68.4 KB Created: 2021-04-04 21:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 12952b0fb639b0c3b6d56a6f32bb9ab3 SHA-1: 1ed4ae8a4811fb428f377b8c8ecd852a853db85f SHA-256: 87039ce0a5b965635c5607e9a9f5f9d4ac2d84ce711a94cb391932a4acca7924
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated terms, such as 'Oster clipper guide comb set'. One of the primary external URIs, https://jacksth.ru/wix?keyword=oster+clipper+guide+comb+set, appears to be the intended destination for users seeking information related to the document's apparent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=oster+clipper+guide+comb+set PDF link annotation
    • http://dopogabijup.mywebcommunity.org/22395168847.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/e6c7682814a9.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/puluvot.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/Tftidib/save_the_princess_running_dress_up_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/X7ijJgc/lekobodevom.pdfIn PDF document text
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/96227a03bd93881.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/hajeljc/23594881443.pdfIn PDF document text
    • https://jajozopikikaju.weebly.com/uploads/1/3/4/3/134359408/xoxubonulin.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/AhaAGhc/61944949945.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/dikobepibelun/hp_photosmart_7960_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1350592c-e42d-43ea-afa6-6edcee3630c9/dedepodas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a343f5a0-bd11-41c1-9f36-56db373e825a/sigos.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/49956330933.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/boxigajivupine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7044d92c-9387-467c-b37b-4513a66a60e7/calories_in_a_sausage_breakfast_toaster_from_sonic.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/softball_uniforms_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/bodoni_72_font_family_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/2005_toyota_tundra_stereo_wiring_diagram.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/3277444579.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/titojavis.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/kepoluvejiregowowawa.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/joxonuzawuxuvutujufu.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 5348 bytes
SHA-256: 537a448587402541225c70d6cdef2b4dc407131160f5d9f7da7cd3bb2a3f93c3
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 11128 bytes
SHA-256: 3ef02977f85f94ceecc69d12870357836f6779a41d9e02d062f434f5f47a153d

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