Malicious PDF — malware analysis report

Static analysis result for SHA-256 0387aa4b3b4051df…

MALICIOUS

PDF

65.5 KB Created: 2020-12-02 20:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e84b346d472d7bf6cbbb425357e4ab5 SHA-1: e4ed7b2cefae5b5a5a189db5b305feb7defb15e0 SHA-256: 0387aa4b3b4051df28cd808ef70fc16c806268f7587b03187f7daed9f6c019a3
284 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links hosted on disposable domains. The ML classifier also strongly flagged this sample. The document's purpose appears to be a link farm, likely for SEO manipulation or to distribute further malicious content, as indicated by the numerous links to PDFs on various weebly.com subdomains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://gettraff.ru/aws?utm_term=simple+synonyms+pdf In PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/5420971.pdfIn PDF document text
    • https://vubedokixe.weebly.com/uploads/1/3/4/7/134716192/mikiguwuvujebok-xumefinezotamos-lusez.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/menosinekikozub-debavipo-lokumokebazeba.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/rokotubalokubiw.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/8919533.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/3e970d749ca0699.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/64dfea9.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/8199834.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/4e28101543081.pdfIn PDF document text
    • https://pepowogipiwud.weebly.com/uploads/1/3/4/3/134344034/16f9b5942063.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/luruwipamok.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/mazogesunu.pdfIn PDF document text
    • https://lowutifita.weebly.com/uploads/1/3/4/3/134352456/mugepozoj.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/1ff521ee-490b-4d6e-87bf-4516bd5ebfb7/tipos_de_trapezoides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab7b61d-9ab9-4f35-b378-a81b6397c9e9/cogat_practice_test.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_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 5084 bytes
SHA-256: 8f9ec0c9382ee44d59d0bdf7a9ae93b03248ab6ae11071c60fc60b59087b3c1f
font_01_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 9740 bytes
SHA-256: 8e65f13e4f4f613343f7472deb0424f990c08b7c9603aa95b439540c9a938ee1

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