Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159425fddb36d47…

MALICIOUS

PDF

77.7 KB Created: 2020-11-30 18:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 81a49f09c5ee57b9b0868bd87f83238f SHA-1: 14fd96468af0d2a9c507058f379009bca1661967 SHA-256: 2159425fddb36d47b05f6a1bf022932d0306bf2dabc202c38a2cfd5e3f13571b
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme, likely using embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adjectives+and+adverbs+sentences+worksheets PDF link annotation
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/lafedanulin-fovoputuzax-bituwu-duxikav.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/9513880.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/rogozik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f8dccc0f2c11.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/fabujakedosupowog.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/6472802bf5f4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7ea32e32-02fc-4f5d-bdce-d07fb63e17fe/62462656111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2f7f2c-ef98-4e93-bdfa-e8579d5b6f22/zusitonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefbb930-74b9-4e7f-9d91-f1b53956e403/toucan_for_sale_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53994d55-c0bf-45d9-8491-c8042f234713/91624143188.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf65fe173fb5383b9a6eda/1606379006301/40142634955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66787395-9d6d-493a-bea0-5350d22b94f5/anatomy_of_the_spirit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246fb9f6-a35d-4de1-8979-ddd3c892eca1/74105683804.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 5204 bytes
SHA-256: 59a7a519d2252c156137cba9cf94dfe79b2448e0c5cc697db67a7ebe1ede5a6c
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10556 bytes
SHA-256: 5d5bcc707ea5bbcd3a1982f54cde0915d682ecc2981e0e826c09491551f0b35c
font_02_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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