Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf9473b7597d26f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-20 20:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 269f2bfef6c4afcf1126ac5d0c525d5b SHA-1: 7ba4aa9a0e4a6dde4fca8fc1dbcaf88ebe48bb21 SHA-256: 7bf9473b7597d26f2fd178b574c8d9444eaa96ae54233e832d5656fa2f489125
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, appears to be a lure related to a common search query, directing users to external sites.

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 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://jacksth.ru/strik?utm_term=what+can+cause+burning+skin+sensation PDF link annotation
    • http://hustlinmoney.com/382755923079umno.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/geZ0Iid/76631781383.pdfIn PDF document text
    • http://big-ita.space/vifusejijajimezjeyv3.pdfIn PDF document text
    • http://thesimplycompleteseries.com/48526413951h5xx8.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/jdGp8hi/cars_movie_soundtrack_life_is_a_highway.pdfIn PDF document text
    • http://futup.ru/seven_wonders_of_the_world_with_pictures_and_informationhweph.pdfIn PDF document text
    • http://hookup756.fun/vixekodovaduxuzijizonagu6yl80.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iageP9i/mortal_kombat_xl_vs_11_cual_es_mejor.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/mKzNgcS/pac_12_track_and_field_championships_2019_live.pdfIn PDF document text
    • http://canonsburglake.com/making_karyotypes_worksheet_answerswhluq.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/ggfhhaQ/among_us_mod_apk_imposter_hack_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/NMijjhm/boxukilolafizorika.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/numunenoji/terraform_aurora_cluster.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/terraform_aws_iam_policy_resource.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/ccna_chapter_3_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/75207472689.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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5248 bytes
SHA-256: 90bca3bcb6f4cc4e7882b4f3d2d6f36700046e38df5884d3898820227b94661d
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10284 bytes
SHA-256: e2215c6b9e96a17e19e6b23336ddd255afc0442b313eed896fc2aea6588cb13e

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