Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b24856233d0b5…

MALICIOUS

PDF

71.2 KB Created: 2021-02-22 04:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a56cd328b07aa443d716ddddc4f8df7a SHA-1: 9bdb6aeb6bc04f01dd1a8a1beb76e4237d9e1444 SHA-256: ed1b24856233d0b59f49e93768afeeb5d8e768ccb6258a15e1388fe2c7a80ab0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

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://bologen.ru/123?utm_term=romeo+and+juliet+act+1+scene+2+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5ff4c50829d9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5feb4f697cd6e.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/5wifhaa/megan_fox_2020_dating.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/iijcBuC/41970186881.pdfIn PDF document text
    • http://penerete.66ghz.com/logic_breadboard_simulator_apk.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/4443908.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/3652534.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/punizeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fd85be02975e.pdfIn PDF document text
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/eef38da343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_5fef48a6892b2.pdfIn PDF document text
    • http://zifasito.22web.org/kingdom_hearts_union_x_reroll_guide.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/c7a2a790deef.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/eyhcrEY/mikuvojovazaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxigukupem.epizy.com/angular_6_global_variable_in_template.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/31540693424.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_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 5444 bytes
SHA-256: 10ad0c183411c63b1f2884b91395689294c4f8b2b6a74b7a4d160b28063871fe
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10612 bytes
SHA-256: 4ad3e62b6cc49a96f09e43f8a1f3fa9387c7fc10fd4c203c8c46b223b0489a4e

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