Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99bf24d957eb3a9…

MALICIOUS

PDF

76.5 KB Created: 2020-12-28 18:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a11e7e069b85652bfa62b8e812a39c00 SHA-1: 95f6a9c05884f4552a803ee39e7b59680915feac SHA-256: a99bf24d957eb3a9c51919633688e2a0dd9e17307ff6c806388328116a83ff73
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 0.9998

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://traffking.ru/strik?utm_term=cheat+for+among+us+guide+map PDF link annotation
    • https://cdn.sqhk.co/buweworipoza/XgiPTjh/suxenipolexenomolawedid.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/5029852.pdfIn PDF document text
    • https://xivamiwilazux.weebly.com/uploads/1/3/4/7/134742933/9a63534a775f903.pdfIn PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/firapew_zuxozelabuz_zalevafel_vonep.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/lerepomuxe.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/monegidox.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/icQMijG/javuxiguxitabijigude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8327fd-69a7-46a2-8df6-89c588c92eed/la_fitness_communal_showers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/mathematics_formula_in_hindi_for_competitive_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed97b567-f0da-4dc1-9167-b2fd640a17a7/essentials_of_business_communication_8th_edition_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/airmen_form_last_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4091b50b-3c43-4385-9544-9ed7548cdb62/temigonajal.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5328 bytes
SHA-256: 4749780ad07d5380199ef3739137beb47fe09337f6442249a579da533c9c5f51
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10772 bytes
SHA-256: d5a413eb2ac878c75d2ccbaf3b57f24d77a8334c04986a7ec61e5b2f6508bd8c

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