Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56ace51174c2a55…

MALICIOUS

PDF

77.0 KB Created: 2021-05-22 06:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d6ae7e1334d32558e58b519863e3a5c SHA-1: 12cff3d0c11ffcf08a58f39840800a334085194c SHA-256: e56ace51174c2a551f91ee65e88a4a06db6a172af204efa4c2bfed4a9211e828
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://resalured.ru/strik?utm_term=discuss+the+theme+of+sight+and+blindness+in+oedipus+the+king PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6053802067130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_606351833a2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_60437811430c1.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/fdaf6ec.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/toxeveri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_605f5dd03d726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_6040a2a031e20.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/julaxel/91141624904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04deb08-274b-47d0-86e7-d006d9c88bf0/le_petit_prince_english_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1285fba7-ab3f-48f7-9063-be9f68eac744/call_of_duty_wont_update_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/90543717201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13a1c53-6113-499b-a7f1-087ac51a5eaf/17576580435.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/joxupukobuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7277fabc-3b33-429c-b739-b911f3ed17b8/7356726307.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/instax_mini_8.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/janawev.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/wozirowaguxeruvogazakoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9d866b-1c1c-4283-a29c-78d30e130378/why_is_my_garbage_disposal_leaking_from_the_reset_button.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/rupubofupejuwoxurukuvisir.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/sizixivinugiwuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/introduction_email_template_new_job.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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5676 bytes
SHA-256: a5b2f3efb3d135494f7ee6da0f1404d3db6afa1ad27e38dee9a84e0e2328df67
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 11008 bytes
SHA-256: b12fe4b62f1472c1081a5e3bc0103ea78d209fde1c2ad35f46b2d6d29c33deee

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