Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55634a6bc7af67f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 05:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 365d2e7585a1175fe19bba5d3a14ded8 SHA-1: 1de176f6d3656d18ca1ce412b40f78870c0ef3ca SHA-256: d55634a6bc7af67f058bb0f7ce69fb2b434c95e4acb809400c720b8b97b7144a
186 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 of which point to disposable domains and are likely part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

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://botokaw.ru/award?keyword=quantitative+aptitude+exam+pdf PDF link annotation
    • http://jutidewolojura.mypressonline.com/kekuramagux.pdfIn PDF document text
    • http://italiahot.space/norcold_refrigerator_troubleshooting_model.1200lrimy0jor.pdfIn PDF document text
    • http://hamlikjorettoop.ru/java_spring_resttemplate_sslgpu09.pdfIn PDF document text
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/2860239.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/woleruvuwatemom.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/cfa_level_1_mock_exam_with_answers_free.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/7604589.pdfIn PDF document text
    • https://rekopazexejur.weebly.com/uploads/1/3/4/6/134602417/luzibijorufivat.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/penede_rosatunusifines_gonun_wojixozaz.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/8614613.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/letakesiruja-wuxavowus.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/how_to_prime_traxxas_t-maxx.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/e224a661-112a-456d-bfad-116896abd733/neloxejopudili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72da206e-1c34-40b5-ad43-9f84f9ec2059/is_hearts_of_iron_4_free.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_38b2fb61479a4ec287b502900fab56b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bbd44-2114-49d9-8bed-4cb22c3422fe/que_es_ser_un_lider_de_jovenes_cristianos.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_906af204f11741709f227ffea1344ed6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b75126-f6fc-413b-8b20-602e431b50ca/forklift_training_video.pdfIn PDF document text
    • https://bc1ffd8b-75eb-417b-8f1b-a2d0870937e7.filesusr.com/ugd/e2f197_ea4ad34265cc4b17b06c7f27b8fc8dbf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 4840 bytes
SHA-256: 95f04cbf2d2e2875b3fe7763d4f9503e27978093c0fdecb1118e5ef2d4963deb
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 11836 bytes
SHA-256: bc3ce217bd775f0994120189db1534f10e42737f614be1d0d94a74da02ef7afc
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378