Malicious PDF — malware analysis report

Static analysis result for SHA-256 4126ec94f7917910…

MALICIOUS

PDF

85.2 KB Created: 2020-12-27 13:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b172fad666758a467d3bc446a425ee9f SHA-1: ca41ba6cc6d65295f6c7dcb92a8718a09063f137 SHA-256: 4126ec94f79179104480a87cd277a31e81abf0c6ddc2d1f12d1e095dd44aa6e1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+divine+nine+book+pdf In PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/gunalupur-guxojamojufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fb75a6a8e8be.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/zowujejifexixiko.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://uploads.strikinglycdn.com/files/1297f5b1-5344-428f-a44c-be6391fa03f3/what_is_the_goal_of_cognitive_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebd8d10-1d75-43f6-85dd-4f9fa3cf2dac/el_arte_de_no_amargarse_la_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/advanced_life_support_course_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/70284623100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637ebcd3-2df7-4948-a8af-dca032523d89/120542482.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/alzheimer_s_disease_association_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/26932702461.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/adobe_acrobat_pro_dc_free_softonic.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 4536 bytes
SHA-256: 1417946799ff457df9a9f4031942bdd6cead9878649f3c436d751966010cce41
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10664 bytes
SHA-256: fce4cd6822726c1667d48aded51382b11860ba26c8bcd918710ed2e836c1f377
font_03_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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