Malicious PDF — malware analysis report

Static analysis result for SHA-256 f332fc6cad9f2b32…

MALICIOUS

PDF

65.2 KB Created: 2020-11-19 17:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ffb9e553ba9ecc045ee84338738d1a2 SHA-1: bf671954be32fdb0b36696cf4f6a7bb8805cedfd SHA-256: f332fc6cad9f2b32e98621e4230935448a1d07e86ddc1eaafc9ff8414663611d
222 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, indicative of a link farm or phishing campaign. The presence of a 'download button' heuristic further supports the lure of a fake download. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=holy+ghost+mp3+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f9aae3eb2f97.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/zasorulapedezad_xatebo_tejovejete_lariwaro.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/f0a367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/biosystematics_and_taxonomy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/foxfire_1.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/comparing_biography_and_autobiography_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287c58f4-cfdc-463d-9172-f9b3263a3102/legend_maker_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03119b46-b213-4d28-ac05-126640e09086/open_office_4.0.1_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/57133207107.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/57114484027.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_off0000c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 5596 bytes
SHA-256: 55af9822727cc78263f21a779960ee97cde391d0367bf160568c6f68cb56c9ce
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 10884 bytes
SHA-256: 2091a872ee017ae6a978a050c5e64374e6adbc7618edfffc6d7e5cf20ae9ed38

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