Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f05a3a5a5d070…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 07:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e482694cbbe6bfd9d051352031a0f44 SHA-1: 9e6d40ed1cc7ef06ae7caf0d93ee172e989b3e88 SHA-256: b15f05a3a5a5d0702c9ac501a0d0f553b1a45060dd85dbd6b42258ff57cf9400
186 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 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://botokaw.ru/award?keyword=construction+quality+assurance+plan+pdf PDF link annotation
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/2320342.pdfIn PDF document text
    • http://zakukat.iblogger.org/guide_auto_entrepreneur_2019_urssaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_6059e8a482bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6019d8a2959d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_601dc97f9eb5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_605d22c3f06c9.pdfIn PDF document text
    • http://xavukagidasali.iblogger.org/android_get_browser_history_programmatically_marshmallow.pdfIn PDF document text
    • http://suxelutete.22web.org/functions_and_relations_in_maths.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5ff2f634a60bf.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/8127454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_603af4a9c8f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_6026e8d7b7095.pdfIn PDF document text
    • http://fefogumok.22web.org/10003905405.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/gubepipoke-pevevoligub-begawewufax.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/pinaxevapoxafe_jobagisod.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/gurupixabogivaz/edexcel_a_level_geography_textbook_answers.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/menorah_high_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/vegetarian_keto_diet_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/weluwemunebu.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/math_calculator_plus_apk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5280 bytes
SHA-256: c9089f6a68724a0b22747680e9d21b4f8e359573058453c6fb99034c885a84e7
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10844 bytes
SHA-256: f7407c6f7019bfca5cfa018fe205ea2b472c1eb1c59544cedb8153d6955c1abd

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