Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca76e51ad6a23e1…

MALICIOUS

PDF

79.6 KB Created: 2021-04-27 09:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77e469f0862c78ab80596da457df854a SHA-1: b8256954ff44d98b21f0bacffe68b091e4bb4f47 SHA-256: 2ca76e51ad6a23e1b9d76a1e5fe1a7b4535355c698410d6972c01a83eb31d98d
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://midufefew.ru/strik?utm_term=war+of+the+worlds+%25282019+tv+series%2529+episode+8 PDF link annotation
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/1417359.pdfIn PDF document text
    • https://talekadibozevo.weebly.com/uploads/1/3/5/3/135393667/zoxafigulunowudolite.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/dhcjgpX/93253523361.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/6836658.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ohjjjgM/free_country_music_online_radio_stations.pdfIn PDF document text
    • http://greatholl.com/jexupozaropujotilitanalinuatk.pdfIn PDF document text
    • http://fortysgjdk.fun/accounting_for_decision_making_questions_and_answersug307.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/budurowigizakozapuza.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jfhhgcQ/cross_stitch_monogram_patterns.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/jirexudenadefu.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/6824388.pdfIn PDF document text
    • https://cdn.sqhk.co/porifepi/hdziflu/zozanusodugisapudukasebe.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/xesowovuzen.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/gosewe-jasusipilasax.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/e03f9e89-b73e-4c17-bb4d-2ec5bdd655bd/mibukodudemozolusovab.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/fokalotunir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43185d49-45df-491c-8dc1-736b0fdac0d2/stone_soup_burleson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f450bb07-0038-49e5-8902-8b0951025571/79012619215.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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 6124 bytes
SHA-256: 1929e0c459a89b4a9df6d38ef8dcf55e15204a2d9541a88a41267de178dc7d9b
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10900 bytes
SHA-256: 3ba84aafbb4121335484cfbba022a1f02608b27b57202656ed930a48676ca569

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