Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f9577c35d3474c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 21:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3cbed3491adcd0d0fd512fb020c80cf SHA-1: 094dda8d541e1a0729264d993396aaafaaece85a SHA-256: c4f9577c35d3474c72e6d893483a65b6ccf84ac6a103d5246ee18023801a99cd
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified as a link farm by heuristics. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the nature of the heuristics suggest this document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=delonghi+safety+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461497/normal_5fe8f102bfc30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fee69bd1b990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60061d3b18b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_604765103e15f.pdfIn PDF document text
    • http://fitixezuveseli.22web.org/42830096840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_602d4d90f36b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_6040b25a291bf.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/where_to_buy_zoomer_kitty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_60631051a3734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_e0ffa8957d304388a7dd9a9c89879d53.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_24a31d2a07bc45f69a2a62327b93f8d0.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_403bb43c18334bbfab096ff4d3caf5a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e84cc9-6475-45ac-b1f9-a1ff8e83498c/honda_eu3000is_oil_change.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_a6fdfc1c28144520870666736b652b6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0593002-a4c6-4d43-8509-48016595a40e/98494785952.pdfIn PDF document text
    • http://bubinepet.epizy.com/skewed_distribution.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_a3e96b49ea3b492d998a0e317ac2acc8.pdf?index=trueIn PDF document text
    • http://gozuved.rf.gd/falciform_ligament_ligamentum_teres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdb954c-eef8-4620-b443-16123826b085/zmodo_security_camera_not_connecting_to_wifi.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/nowilofof.pdfIn PDF document text
    • http://reruwok.rf.gd/me_before_you_book.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 5132 bytes
SHA-256: 73694a28f6918ab81cea29ceaef0e6a1e1657f9d35e1bba6a448fcc52316de21
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 11192 bytes
SHA-256: 67479368ecf62b97a9d3273b2c5c58a719d51d792f0da84031800003b2a904e8

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