Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91aebd6cff54e28…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 07:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7c34e0f28aa1393768eb9de6d4723e6 SHA-1: 569e73c3d2e8e9ceaf97a11a67d8e6cf70656723 SHA-256: b91aebd6cff54e28415c0ea8c0e6e275d56cb624cbc47098692967cb5f4a4187
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://jottigo.ru/strik?utm_term=where+to+buy+houseplants+in+portland+oregon PDF link annotation
    • https://cdn.sqhk.co/kamozipu/b1PHBiX/45296410947.pdfIn PDF document text
    • https://cdn.sqhk.co/pobisobat/fiivicP/89356371634.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jidigiV/95058730411.pdfIn PDF document text
    • http://kuxemanes.medianewsonline.com/lojuzavipopix.pdfIn PDF document text
    • http://suvoramitasowiv.22web.org/78016745720.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/tulilubanovetuzex.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/LhaFiaz/doot_meme_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/ghgYjjt/10987490920.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/ropuboxivaginepo.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/cOxjkgj/my_notes_notepad_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jfhcssg/91493276005.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gnYAoh1/ct_lottery_play_4_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujakogi.onlinewebshop.net/arbitration_and_conciliation_act_amendment_2020.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/sowuzot.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/bujexufujusabonekax.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/bufamofirigef.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/lanuramajaken.pdfIn PDF document text
    • http://juwelaloz.epizy.com/penyakit_arteri_koroner.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/wupamolowutedi.pdfIn PDF document text
    • http://paporoj.rf.gd/56366863266.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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 5476 bytes
SHA-256: 3ad210ff4836fac8b0a436d0c9f5917fc9c0992c1d42d818c4bdc5c695da7fa3
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 12172 bytes
SHA-256: 384c7d128bf44613531feeb132674e888a6f33b52e07c5042a04c1776edabad9

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