Malicious PDF — malware analysis report

Static analysis result for SHA-256 5673a3da5a3a925d…

MALICIOUS

PDF

78.3 KB Created: 2021-03-06 10:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9362ff9f334bed63670c51b95536e928 SHA-1: a561ee8bf2ed51f690016eaaf3376152edd0f69f SHA-256: 5673a3da5a3a925d9d76364e7d932c94a73fa760a4895647f9c761a898f7adbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, likely initiated via spearphishing.

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://gimoguvi.ru/award?keyword=the+secret+life+of+pets+2+characters+in+real+life PDF link annotation
    • https://lefipejime.weebly.com/uploads/1/3/4/6/134668800/wuteku-duxerosari.pdfIn PDF document text
    • https://desalova.weebly.com/uploads/1/3/0/8/130814935/43ad1cf.pdfIn PDF document text
    • https://mebugiroxubo.weebly.com/uploads/1/3/0/7/130776511/7129498.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/7534547.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/dowuvadigano.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/fezamamenedakaj.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/af7d5.pdfIn PDF document text
    • http://delunabiwefepef.22web.org/damian_marley_patience_song.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/fajetufekejo/duvaxeverupire.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/algebra_2_saxon_math_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/63683611691.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/ajax_submit_form_after_validation.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/daretokogabajunosona.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/vebavipadedobov.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/96429657183.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/logical_reasoning_practice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/let_s_talk_about_jesus_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/reported_speech_questions_and_imperatives_exercises.pdfIn PDF document text
    • http://terezeso.epizy.com/67586999767.pdfIn PDF document text
    • http://kezazole.epizy.com/12949380638.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_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 5184 bytes
SHA-256: efdd099f85ff797dd280ed297c127d14f2cc4103ebba3bd6bcc3afe339d8db31
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 10652 bytes
SHA-256: 1906edd7696178e7884aa82d9324760eae37ac7112b7adcbb7bcceee0f765ba8

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