Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fb109964e3f26d…

MALICIOUS

PDF

73.4 KB Created: 2020-11-20 09:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58e554d632b908d4bb8b4596782b087d SHA-1: d17d81176db3ea8e62a28ab9d8936394db2f4576 SHA-256: 18fb109964e3f26dc7633e2405d6504cf14c95419dbf14408e1a849872da2794
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external links suggest a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish user credentials or lead them to further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=apple+watch+series+3+size+guide In PDF document text
    • https://nurenevomezuku.weebly.com/uploads/1/3/4/6/134641424/ravov-bepuguvi-jenibimijiwadev-vigojo.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/2e23ce29-386b-47e5-aae7-7cb576a0d8e2/57880810089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d29aa66-cc74-4912-8af5-14bd8215bab1/61262323958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5feb323a-223f-4669-925a-2e8d9bf5fc00/eric_thomas_speech_transcript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74712a75-7836-4f5f-bf25-149ea153fa58/fantasy_prone_personality_disorder_dsm-5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115e8a45-547b-420c-ba14-ebe83686212b/belewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2d34c2-060c-41a6-8a82-76df79b822b0/nubevowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b440d7-9907-4bcf-a3a0-45effb81114b/radowatek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fffd96-e2f7-4eb0-8dd4-7775c9a7f5ee/fejajekukejetiposivukere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a057f148-fcc1-4ead-8431-c78275621030/fuxawutafojutagugadifigam.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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5632 bytes
SHA-256: ecc853b34f3d1493baa9be12dca5274587cff8bde29453a60c6546a49e3f111c
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 11332 bytes
SHA-256: 554e2f78c782da9c13ffe6b76a4f336984253ced0c64ff66a964b39330bbcc16

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