Malicious PDF — malware analysis report

Static analysis result for SHA-256 63343dba765b8c89…

MALICIOUS

PDF

70.3 KB Created: 2021-05-14 06:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 988228eea7260234ecb20dc334f66f62 SHA-1: 6c3bb603f2ad58b24e7ba3a2d0ef4f47efebe650 SHA-256: 63343dba765b8c89c50ae56fb1f3151ae8d4a3fa5c8b927f2b9e47e8ca2acd76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded URLs, with one prominent URL identified as a potential phishing or malware distribution site. Heuristics indicate the PDF is a link farm on disposable hosting and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than a legitimate document, and the presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=clasificaci%25C3%25B3n+de+las+funciones+y+ejemplos PDF link annotation
    • http://fogivuwekewelub.iblogger.org/ansul_fire_suppression_system_training.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/7915942.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/3364821.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/imf_january_2019_report.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/napejaxosinages/manual_de_urbanidad_y_buenas_costumbres_carreo.pdfIn PDF document text
    • http://bemerolafun.epizy.com/charles_baudelaire_le_spleen_de_paris.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_7f47e003bf9349449577fbc816288a89.pdf?index=trueIn PDF document text
    • http://velevemi.epizy.com/xoxufim.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/49680889867.pdfIn PDF document text
    • http://rowagaparik.rf.gd/lorijexonu.pdfIn PDF document text
    • http://tinanatibora.rf.gd/xokujexi.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/duneravosudatu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/dokoworosarositazuwegaru.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_a248e0ff7fe747b2bf76ee4919da8b14.pdf?index=trueIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_47fb1a3762b349c09b0b71f62d91e700.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_4741ed91e63d4e56836c4adf051bbb02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/galaxy_s4_mini_price_in_nigeria.pdfIn PDF document text
    • http://sujabugepebizud.rf.gd/vibiwifafafuvep.pdfIn PDF document text
    • http://xafegewiko.epizy.com/making_informed_decisions_worksheet_answer_key.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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 5424 bytes
SHA-256: 257419a983be3316d4791dbbc247086eefeb7c582740d916212fbeae9f405a99
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10828 bytes
SHA-256: 80aa1a25d400e42dd263eec37792b1286c35406764e9fdc0b0d35d1edee3b76c

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