Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c5b9cb0b4b262a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 06:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ef0f375c8f44d54f98770cddac8836ec SHA-1: 2c576887e83413de2378a35c3d37848cf7fd48ca SHA-256: f7c5b9cb0b4b262a31797ccb425d1628d7d0d0aa417e7b371006bb0432a014d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to printer manuals, likely serving as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=hp+laserjet+pro+400+m401n+manual PDF link annotation
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/19621f042.pdfIn PDF document text
    • http://mexicotop.xyz/29595339607hztxw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff170b1c2d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fdc5f18b96c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_60305a8ba6532.pdfIn PDF document text
    • http://gouliwer.online/fe_other_disciplines_review_manual_lindeburglffrs.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/4289923.pdfIn PDF document text
    • http://nikaold.site/frigidaire_affinity_washer_clear_error_codes7c0l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_601f5a4b164b4.pdfIn PDF document text
    • https://gipurama.weebly.com/uploads/1/3/5/9/135966135/rodurox-litun-nuwokomu-tuvokovapewas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_6023f49b5c8f4.pdfIn PDF document text
    • http://azules.ru/longman_business_english_dictionary_free_downloadovwu4.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/8558353413.pdfIn PDF document text
    • http://lagutobokoza.22web.org/insyde_h2o_bios_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fd158c65b780.pdfIn PDF document text
    • http://gatorama.space/46480818954u6hr.pdfIn PDF document text
    • https://varigero.weebly.com/uploads/1/3/4/4/134443598/6564932.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/68612a38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topemuzopapegu.epizy.com/39938209124.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5284 bytes
SHA-256: c984b2b1a9d23c5ef0f87d50738f3cd7e929c14ded9cbf32f1f0a33735b9ee43
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10564 bytes
SHA-256: 1a222854d397c4208ef4b9c9ceb1af2915b8d9b2c210cd7f044edd4eabd560fc

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