Malicious PDF — malware analysis report

Static analysis result for SHA-256 5933b5110dbd9b50…

MALICIOUS

PDF

85.3 KB Created: 2021-04-08 08:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e94a45bf8046c1cd0fba1c8755f5e46e SHA-1: 59154be82bc7517d6b8c1d73df0050c2854bdd41 SHA-256: 5933b5110dbd9b5063cb0b34ace56d790a9fd7fe9079281d69ff8ac3898b0ee0
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://midufefew.ru/wix?keyword=civil+war+%2526+reconstruction+answers', suggests a keyword-based lure. The presence of ClamAV and ML heuristics flagging the file as malicious, along with the 'PDF_SEO_LINK_FARM' and 'SE_CALLBACK_LURE' findings, indicates a phishing or scam attempt.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/wix?keyword=civil+war+%2526+reconstruction+answers PDF link annotation
    • http://tuwuneluzuso.22web.org/sasevudun.pdfIn PDF document text
    • http://wisecredit.info/microsoft_online_cover_letter_templates1h3zm.pdfIn PDF document text
    • http://paktum.pro/how_many_calories_in_a_burger_king_breakfast_sandwichqtnp0.pdfIn PDF document text
    • http://sesaruzuvibi.22web.org/23239660058.pdfIn PDF document text
    • http://padlamadla.site/boy_in_the_striped_pajamas_movie_storye6j6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_603f9a498d615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6053c53121df2.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/dukexajuj/28337926088.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_f933b938a9c84e50a755a8cffb5f560b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/7607447488.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_2285f39c6a434b33bed44c6a2ff9c562.pdf?index=trueIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_f7b90dd064434a36b9c8b8b10939095a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/zokoxopebinojobadubebar.pdfIn PDF document text
    • http://bopulamumu.rf.gd/70833875996.pdfIn PDF document text
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_2016e47d8fce4ebf9aa3b5503b38ceda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/90730200828.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/bose_universal_remote_device_codes_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/86170751751.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/xoluzotirobiritafona.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_817c7b16cd9548439f9f8ecf7edab1df.pdf?index=trueIn 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_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 4560 bytes
SHA-256: ee058753d41a49bfaa67c9e96bfe1e05163a23f580275cbd19b67f284c63925a
font_01_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 11460 bytes
SHA-256: 9faee00c24832d008f733e9d4a6a55cf362eb1919317fc065cf76fb0858276df

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