Malicious PDF — malware analysis report

Static analysis result for SHA-256 57596edb9f501d1e…

MALICIOUS

PDF

79.0 KB Created: 2021-06-01 07:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 12e50a836900bf780bb97b6aec653c5c SHA-1: 07da3d66c6fbd09bbe7d4c6507aa68722954266c SHA-256: 57596edb9f501d1e603ef61be12100fb344449d100cc16e5aea5d3ee31e0901d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://infrive.ru/pbw?utm_term=how+to+pair+audio+technica+bluetooth PDF link annotation
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/zefunutipepilit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_604a7e80c2074.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/62b621d7b7fb6.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/4354179.pdfIn PDF document text
    • https://kugekubaf.weebly.com/uploads/1/3/7/5/137511437/kitedikimowival.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/raligowifefak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6061aa4480801.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/ranifepiwu.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/nokejugoxakufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60491d4f8110c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_604c9bf81f8db.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/1a01521f-c1c0-40c8-9054-b3607a713b71/dupefetekerasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ff956a-55d4-4570-87a3-5092ab41187b/xiwijidajij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de891c79-2e21-4e12-9b8a-102c51085d2e/jisavusavirusiga.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/19324251309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16370b8-cfc0-41cc-84fd-1d29553382bc/cbt_worksheets_for_depression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a7fb1c-1ad5-4a70-b7a5-80ae25bea50b/21044708187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8bc98c-585f-4890-8c0a-a25816505366/fisher_paykel_fridge_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4482b5a6-c03a-4c1b-890e-46ebee2a8730/89234873553.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e79c8f6-d51f-4949-a7c0-a805f0982614/28995524805.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_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 5176 bytes
SHA-256: 9a15667d8f2fff163d57e677b61e0b3f8b1ca977c983799635c45e067727bf3b
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 13600 bytes
SHA-256: 0dce1817f844814813ef6ac8dc595d5f71e4be8b473cdb62a0e158030c4732dd