Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b1203ab2409979…

MALICIOUS

PDF

81.8 KB Created: 2021-06-05 03:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc04d58b52e01de80ef48ac55be7f44a SHA-1: 1794f51113ceb0ce530fa21a7dcc1e020867e5b9 SHA-256: c7b1203ab2409979d537bfa463f3806e5dc5bb8af44e595011549e7bca7eab2a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a spearphishing attachment used to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://laborke.ru/pbw?utm_term=will+my+hero+academia+be+dubbed+on+hulu PDF link annotation
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/bomuzamo-sixovobamur.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/viromepifebitotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5fd9c56c010ea.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/fekaxen.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/e929dfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5ffe28499cc0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fe45a896ee0c.pdfIn PDF document text
    • https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/0ed84bc.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/d57c2bae-f04c-4908-90f9-19abf548c386/82875050314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7419116-2403-483f-82dc-913341813773/how_to_use_a_compound_miter_saw_to_cut_crown_molding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd727cb-8ea4-467d-bc1f-43661fb52158/tapunavenunutij.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144440058/8759302665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02515e34-92ad-41af-af3a-16c676d1aee9/wordpress_tutorial_complete_guide.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/jumoviluretewalabaniw.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413565/rojapebokupexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c8f70b-2a69-43b8-be2b-260eac1da86b/67257908138.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144452067/diep_io_mod_apk_unlimited_upgrades_1.3.0.pdfIn PDF document text
    • http://suniger.pbworks.com/f/aesthetic_neat_handwriting_font_practice_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06874e2-092d-4715-8813-d5ad6b932404/51870163169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22eb906-c6e3-4b3c-a761-9f128c9e91ac/82617009795.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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 4076 bytes
SHA-256: 564db192e8a1fdbbfe3e0264314c867a529f20b1e73e741a29bca63cb4889b1c
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 5256 bytes
SHA-256: 93398024071aee035c4cd7963e8346da95c3f627fba03bb88d7232c6d8da86ce
font_02_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 11556 bytes
SHA-256: 426f9a0548dcd917677429c0602bc5b1aa65c9e38d24a635b1fec1501e57e2bd