Malicious PDF — malware analysis report

Static analysis result for SHA-256 8947eb1ccb181d5e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-12 05:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1f925385377a024227346dbd978297e4 SHA-1: 481f0aa0715a7bc4b7013fe1b1fb920157aa17fa SHA-256: 8947eb1ccb181d5eb977970234f011fb7fa12b02325ed83208327d59605ec323
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=verilog+interview+questions+and+answers PDF link annotation
    • http://lnstagram-verifedbadge.com/48118859810082ae.pdfIn PDF document text
    • http://xunubinen.22web.org/good_email_signature_templates.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/vebonotifupusoxopa.pdfIn PDF document text
    • http://bugivaf.22web.org/dajulul.pdfIn PDF document text
    • https://giponijas.weebly.com/uploads/1/3/1/4/131453823/1515513.pdfIn PDF document text
    • http://theraisins.pro/19655640742hkqnw.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/1872379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://meridupomosim.epizy.com/90211062518.pdfIn PDF document text
    • http://jofesowevelen.epizy.com/opencv_4_c.pdfIn PDF document text
    • http://toduwez.epizy.com/adnan_sami_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/81983603301.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/pobutuzikeketinu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/unit_circle_trig_worksheet.pdfIn PDF document text
    • http://fomuzuzidoduvi.epizy.com/70901719777.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5236 bytes
SHA-256: f663b25351d220ad9e5d0ced41421eaaa0fcb8497b8feb5a6b0c5f72d036bddd
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10596 bytes
SHA-256: a8bad75ab92b20fbf480c49533617a8fb8e7d1ed5696dcb6dc259e49d628a086