Malicious PDF — malware analysis report

Static analysis result for SHA-256 4140874a8e08d91e…

MALICIOUS

PDF

67.4 KB Created: 2020-11-21 15:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d99d3fa4bf6efcfd673d16e9169885db SHA-1: 7bff61acc8dcfb9c29186125f3f176c10ae2ff81 SHA-256: 4140874a8e08d91e952985b9f6795f5445e99fa7296937acca9dcbfb25a12b19
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or to distribute further malware.

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
  • 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://traffine.ru/123?utm_term=the+total+deer+hunter+manual In PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/suvesewiviga.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/fidom.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/4809770.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/welutemavaluli_rinudiladun.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/rajiwatak.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/9117f2d5df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuforewebub/cannot_connect_to_hidden_wifi_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/remington_03_a3_serial_numbers_4167455.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/67968383235.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/malesoxamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994cb014-14d6-4e69-b423-f413815d46a3/78786717568.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/tamilyogi._com_2020_movies_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 4672 bytes
SHA-256: bb98176ba41576adb63ac6c22a556a47ddf9c33b906810bebeb6c8141d20e740
font_01_sfnt_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10188 bytes
SHA-256: 132e49d55c42e28ba33a0aa4cf363a00b0602f4515b147f051a07cf1c396d20c
font_02_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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