Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b445705d260c64…

MALICIOUS

PDF

67.9 KB Created: 2020-11-17 04:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9b970d5d66b5ed8e42760ca0ff2fb03 SHA-1: 72ae919b77492b9a325a2c684c3aa2d00bcfe347 SHA-256: 49b445705d260c64604c964e276d93d8e44c420dc0bb863ab65d7c8ff866e52d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to boost search engine rankings or distribute malicious content. One prominent URL, 'https://traffnew.ru/123?utm_term=baixar+musicas+gratis+mp3+download+online', suggests a lure related to free music downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=baixar+musicas+gratis+mp3+download+online PDF link annotation
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/logapoxakaw.pdfIn PDF document text
    • https://wuserugojikenek.weebly.com/uploads/1/3/4/5/134513610/5472014.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/3e5133a3-1e2a-4b77-8019-8942387d3920/popok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914479ab-23de-4441-9ff8-b318e28633fa/words_that_start_with_energy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f26506-f66e-446e-ad49-55c9dbe8d208/C3A9valuation_les_polygones_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40caef3e-455b-4c08-af43-dca3a09b5a4d/pexikemozurijegelowefufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b4a0e9-9d75-4254-8ac5-478e78aaf1b7/52048886418.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/chaupai_sahib_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3545e00-e8b5-44f2-bd8b-c5ea3fe1ad4e/23239527662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ed296b-3097-47e9-b7da-ae4b060b9390/fipifod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0456066-9b37-47e2-878c-39968ec07edf/phonak_brio_r-312t_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/90134950758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddd0750-27ea-4a53-a20f-cd06dc83f5dc/zunakedeti.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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 5768 bytes
SHA-256: f05e2639567ba46af5f4ace4ec12436b24025023c17e8b25be693ddd6cf95fdf
font_01_sfnt_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 10604 bytes
SHA-256: b98f450e45ab6f6abaf468bf71c74fafccc72e8821e67920c2d6664804e2d3ac

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