Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dfcda5c2a9c236…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 15:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 88b09b3458a6230727e968e2a8fdb988 SHA-1: 5755fbd7169e7f0e06426debb279a07a27004c32 SHA-256: c4dfcda5c2a9c236a99e679a355198020fe435f70cfae313a3e4115c46e13dd0
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains keywords related to a search query, suggesting a lure to external websites. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or redirection attack pattern. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=plum+headed+parakeet+for+sale+south+africa PDF link annotation
    • http://faxixovojaja.sportsontheweb.net/wefix.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/nipabinuzonaziwipifo.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jfTiahb/insideout_institute_ede-_q.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/authorized_honda_lawn_mower_repair_near_me.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/lista_de_verbos_en_ingls_en_todos_los_tiempos_regulares_e_irregulares.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/FhPjUie/87984546418.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/43578319809.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/70980121695.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/44793446764.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/24966159100.pdfIn PDF document text
    • https://cdn.sqhk.co/xupotuferu/ic14jW4/assaulting_a_police_officer_sentencing_guidelines.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/35877957497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/big_green_egg_large_size.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/14217716469.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nonewuretokuvivin.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/90575766559.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/centring_sheet_hsn_code.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/app_keeps_stopping_android.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_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 5460 bytes
SHA-256: 5d40dccce72a19f251f4b5b9f0240851cd8faf8186e95d7d735dfb70aa9008be
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10916 bytes
SHA-256: f1b460dcecefdc414c5a538c3199717e8458d5e35274b1d68a3d02c8ec59370f

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