Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20bb809e2f5e14…

MALICIOUS

PDF

74.0 KB Created: 2021-04-17 09:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 90a06153c39dc1f87c363baaa4e5c12f SHA-1: a418cdc454fc3d71d5ff3bfc79655adc89730a6c SHA-256: aa20bb809e2f5e143ab7788251ca5477adc7aeceb67ec5291c9ef47d2df30773
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a URL with a 'utm_term' parameter further suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=samsung+c460fw+waste+toner+cartridge PDF link annotation
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/sepifidobisixo.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/7e9621f46c299d.pdfIn PDF document text
    • http://xozonline.ru/canvas_template_free_htmlj033k.pdfIn PDF document text
    • http://kersita.fun/plane_shift_zendikarx1t6z.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/46931849544.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/bf76119756471ef.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/19461909959.pdfIn PDF document text
    • http://design-kvartira.info/mid_latitude_cyclone_grade_12lb2ba.pdfIn PDF document text
    • http://shopee24.site/biotic_and_abiotic_factors_in_a_terrestrial_ecosystemtdvaq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_3a692439db7c4779a067d4080303244f.pdf?index=trueIn PDF document text
    • http://rosevasejila.myartsonline.com/physical_and_chemical_properties_of_ammonia.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/nad_c350_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/gezidasono.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_0f7274ec55824030b15119b0331cf188.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/kia_sedona_2017_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/live_sports_hd_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/kitchenaid_cooktop_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/xurilesupomub.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5888 bytes
SHA-256: 0c5d7fd5799545bdbc2a8646e947fb82fc31126de3c2af642deb741bf6e134f3
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 10096 bytes
SHA-256: 94652b2cc42859f04c1d3137e45e0f7a1c64974f5cd855cdcc881976feb7d8fc

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