Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb02644bd9a115b7…

MALICIOUS

PDF

68.3 KB Created: 2020-12-17 01:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3981f94115fd3ec408ed3546de8311ed SHA-1: 9105f351b489b2e845386c516cefb338ed86d700 SHA-256: bb02644bd9a115b7d7993449a3408bcc7898d4a0bda3f392bc8bd80012a5a718
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 both a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware. The PDF's structure and the presence of many external links suggest an attempt to direct users to malicious content, potentially as part of a phishing campaign.

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://trafffe.ru/aws?utm_term=centralized+computing+pdf PDF link annotation
    • https://xefepalig.weebly.com/uploads/1/3/4/6/134679085/24101cbd8.pdfIn PDF document text
    • https://gozopurejogutix.weebly.com/uploads/1/3/4/5/134578339/xoxuxipo_juzuruzo.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/1486141.pdfIn PDF document text
    • https://lavazelowima.weebly.com/uploads/1/3/4/3/134316744/6dcfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5fbb65646a693.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/f2c0fff7-f501-48d0-90fe-f3678b10a6cd/13329784600.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/job_acceptance_letter_uk_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d33427a199023ab4f616/t/5fc42bbabc819f1cf45c70db/1606691771093/wifesututekafofase.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc705db579eee3ae06b5a39/t/5fd11c1c8c49b64c3bc34c06/1607539741416/kazezetelaromib.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/biomedical_waste_management_and_handling_rules_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9e6e93-ee53-4dd7-adef-b0c655d2787b/69905234797.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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 5252 bytes
SHA-256: 1aff095635c73ae710582f3c4f04108f0fce2c118f858eba593e55f37ce55fb9
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 10324 bytes
SHA-256: 560b45bb792fb814a0046284d613239033d1a8a1253f2c44c19cecd1bd1a7c58

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