Malicious PDF — malware analysis report

Static analysis result for SHA-256 75653dda5a67d8b5…

MALICIOUS

PDF

71.2 KB Created: 2021-02-14 04:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 792e3cf2141d20be6fee4f24ced44ab6 SHA-1: aa1903d978442dd1dc00432f394573b9b2bdc00c SHA-256: 75653dda5a67d8b57ce5fdcbd252bd9656f6775153f6aaace2873f111dd058d3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://maypoin.ru/wix?keyword=elsword+ed+making+guide, is likely part of the lure to direct users to malicious content.

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://maypoin.ru/wix?keyword=elsword+ed+making+guide PDF link annotation
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/2fae750d77cf49.pdfIn PDF document text
    • https://cdn.sqhk.co/sokavuwoz/gigcVjf/iphone_mobile_ringtone_download_pagalworld.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/9ae19d33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fe0a7df96cff.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/ferudefu_mexasa_jadofupu.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/fojonibekubunej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fc9ecaf3fedb.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hfVXjdk/8522090605.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/febopa/43127716316.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/75227175698.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/96145308898.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/spring_boot_thymeleaf_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/delete_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/gajupijaxirofiwuxamodi.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/android_tv_box_anime_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/disorientation_guide_vassar.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/43458754009.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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 5256 bytes
SHA-256: d0716b6623b5e20ffc4be56690f682bfca156fe8cd9f7368dbc0d121a247f865
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10380 bytes
SHA-256: 62386ffc1f4009054eb77b68b96d7d0e1fe618fd4b6940489070a06916e793ee

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