Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cba3a3b5123ab1…

MALICIOUS

PDF

69.5 KB Created: 2020-11-24 21:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d13049c76d8eb2102322c88ac29f1d25 SHA-1: 914229ec6acc14569646063b0f2bdbebb8378d10 SHA-256: b7cba3a3b5123ab12ee17a4f8a7f67a3255a830a5aca81943f31ace8e69733b7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a link farm with 24 external PDF links, suggesting a phishing or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=pathfinder+unexpected+strike PDF link annotation
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/jolilugebo_wuzap.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/9734962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f87aedbe4c18.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/jerejor-katoge.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/f104c541-f51d-4426-a22c-f88feca69dcd/nekuzezadoramesodezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857e195a-4e33-4f32-9e8f-6364046a4e18/88543295851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bbea59-80cf-4675-80f6-3f6c902045dc/because_of_winn_dixie_book_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e442f5-faca-43e4-b5b7-de6389b96b24/hero4_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e297dd41-a679-466b-afc9-064da58917c5/vefawupakinobenubujogek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da9ae5d-c9b6-4e4b-a8fc-9d5ca0c63260/industrial_revolution_dbq_essay_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ae9f95-2e79-4d86-b1b4-81725b91887b/wisebememivemanisow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fc0f94-be82-4315-a28c-cd3045365205/jisifuluwumaviponezixurut.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 5344 bytes
SHA-256: adfd6f529decd05e4956528fed0332db49d7a322c2091dfaa3b922898510864b
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10268 bytes
SHA-256: 98eb03f3ceb2021c757c82ea588fe88d7fd98b1c42bd9c64e42907b5e8032723

Open this report in the interactive analyzer, or submit your own file for analysis.