Malicious PDF — malware analysis report

Static analysis result for SHA-256 773d9fc0e54bdfb9…

MALICIOUS

PDF

71.3 KB Created: 2021-03-18 11:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6790e6fbcc6ccb1bd25e259839fdca7 SHA-1: 6724bac5ac17be97da3edf5565be248b6c67aac7 SHA-256: 773d9fc0e54bdfb941b440079e97dc2be8f8a3f3bac4046ca2814045cf4989dd
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-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://soxebez.ru/strik?utm_term=2013+subaru+wrx+sti+for+sale+ontario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415065/normal_604480e4e27ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_604833a082fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_600dac22a8955.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/foundations_of_parasitology_9th_edition_ebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_603282c517d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_6012512713909.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/ejemplo_de_contrato_de_confidencialidad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_605218667f916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b30b1b3aa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_7eda88876f824753b3de5a5267a45f57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/does_plantar_fasciitis_hurt_in_arch.pdfIn PDF document text
    • http://nufeluzuxaluw.epizy.com/watts_premier_filter-pure_uf3_water_filtration_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/ice_sheets_melting_faster.pdfIn PDF document text
    • http://fajiwuwigekelal.epizy.com/nautical_baby_shower_invitations_templates.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_012b1a5d936f43ca8f17ebe06161d8ef.pdf?index=trueIn 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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 5456 bytes
SHA-256: 7fb9fdf6c61eafd981902df93b2e89df3dcc1b2ee8c89d80bd1495e4690739d5
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 11248 bytes
SHA-256: 9bcc223a81ca1a6a03605fec172c6db30d27290a62d51a329ce95f61db2d6ab1

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