Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d16ddc73fbf733d…

MALICIOUS

PDF

103.0 KB Created: 2021-02-19 06:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a68f459f797b785c1fec7811764d3fad SHA-1: 24236c98d442e18f610ee52cbbc942018a387c4c SHA-256: 9d16ddc73fbf733df1c45f84030cd353ff5fdd1a8fba701dbad901282f05d412
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest malicious intent, likely related to spearphishing.

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 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://leonvi.ru/strik?utm_term=what+is+the+theme+of+go+ask+alice PDF link annotation
    • http://limelusefi.iblogger.org/65086200339.pdfIn PDF document text
    • http://probkin34.xyz/vorumurun69d0i.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/matifesuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/aUVhcQ8/famous_sandwich_shop_vienna.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/fasutar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_5fd1dfe728b3e.pdfIn PDF document text
    • http://cparta.moscow/grandia_guidejhijw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_602684fcb623b.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/gopopove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5ffc98bec993e.pdfIn PDF document text
    • http://kanshoper.site/report_fake_social_security_administration_calls9tt03.pdfIn PDF document text
    • http://gufutaca6.xyz/lopisuxogatifagukevmzisz.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/bulikowexunepov/vulujovem.pdfIn PDF document text
    • http://wefasinufatotag.epizy.com/zorovele.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/69709197400.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_off00015621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 5276 bytes
SHA-256: 06eadeb22f2dec159909c5bd7d15930677fb5ea6c2b572d7a7dee55171107895
font_01_sfnt_off00016805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16805 11616 bytes
SHA-256: 06b1a123a77cf52afed963ea5391ad6b6ffd0acf4cd86b577b519b582b183689

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