Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d03a2dc6f1ae8…

MALICIOUS

PDF

73.8 KB Created: 2021-02-06 10:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a9c55127dc5d886b1b2f6a274343c08f SHA-1: 28060418eed21c12fe6fb08c6feba932911ba36d SHA-256: aa8d03a2dc6f1ae8bcfd9a00aea31e2494082141f7a37f1c90534c19254cb5ac
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical finding for brand-impersonation credential phishing targeting Facebook. The document contains numerous external URIs and embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing campaign. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs and the phishing lure indicate an attempt to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/lugizenoxageso.pdf.
  • 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://druttle.ru/123?utm_term=block+the+pig+game+online PDF link annotation
    • https://cdn.sqhk.co/poronujefino/idiPZwY/59293018977.pdfIn PDF document text
    • http://korecos.ru/966699883290xign.pdfIn PDF document text
    • http://whitetwo.space/past_simple_and_continuous_worksheet_2_affirmativeu152o.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/DZijhc1/36073686829.pdfIn PDF document text
    • http://tifetatujuvib.22web.org/simple_man_shinedown_free_music.pdfIn PDF document text
    • http://fojozefamofu.22web.org/french_reporters_kidnapped_in_afghanistan.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/lugizenoxageso.pdfIn PDF document text
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/tizikelor.pdfIn PDF document text
    • http://all-host.site/vue_js_component_template_filey8fgg.pdfIn PDF document text
    • http://gusanod.22web.org/tazekakelepu.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/dubagufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukigegamoma.epizy.com/all_landforms_and_definitions.pdfIn PDF document text
    • http://dajovufozimok.epizy.com/cm_to_inches_conversion_table.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5188 bytes
SHA-256: 883dd2bb7e57abdb334ee57a4891a6181e3207881cc36d9930cca3d0b03050ff
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 11164 bytes
SHA-256: 3aa5d951f73d9057cfccc7676ab306174b697382a645d2eeee09c3221271af44

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