Malicious PDF — malware analysis report

Static analysis result for SHA-256 d450a79f16085e2b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 05:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4571be6c16fadda3d4881e4fda1dd1d SHA-1: 7ff34327ae01297520b46346b1d548734bbd7484 SHA-256: d450a79f16085e2b12e09496123c0e36203a50fa482e9eadc3108772850e48a7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or engage in phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users.

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.
  • 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/123?utm_term=lookup+medicaid+number+online PDF link annotation
    • https://putazixuxul.weebly.com/uploads/1/3/1/3/131379121/noxomifimupomuni.pdfIn PDF document text
    • http://itgermany.net/java_code_review_comments_templatemudd8.pdfIn PDF document text
    • http://sepibigejakina.22web.org/symbol_barcode_scanner_driver.pdfIn PDF document text
    • https://witatubaf.weebly.com/uploads/1/3/1/6/131606367/1c54a.pdfIn PDF document text
    • http://pihodze.com/business_model_generation_englishy56et.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/jekuwe.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/db3f4bed47b6e72.pdfIn PDF document text
    • http://edapog.online/2199528722829bwo.pdfIn PDF document text
    • http://epipog.com/belesm2z19.pdfIn PDF document text
    • http://choosenews.space/changing_fractions_to_decimals_and_percents_worksheetsb5epo.pdfIn PDF document text
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/soput.pdfIn PDF document text
    • https://fotularujofo.weebly.com/uploads/1/3/0/7/130739653/jatetemewugonuj_xonesevo.pdfIn PDF document text
    • http://strongcreditscore.info/inditex_financial_report_2017aw0a1.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/c7e8a34e8a62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosefijov.epizy.com/wejugikonalokewimufamix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 3008 bytes
SHA-256: d2a31de99f6aa32c3fc9e73d04cd36cd4a144f7150529410b1fcee9c257c398f
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5184 bytes
SHA-256: e097db9014f82f0f7cdcb78d7ac8139fbb48a206157425a7516cb919aefa186a
font_02_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 10688 bytes
SHA-256: 455aa09d36b61aa5ef8a0d62cccaa79628a81da75001c604576aa4ab147c3821

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