Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ecd10c11cbcaa9…

MALICIOUS

PDF

76.1 KB Created: 2021-02-26 12:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6c55a81da81ec69aac271b545aff45af SHA-1: 89da48a5130598b6ba16bea55018b271e7ba05bf SHA-256: 88ecd10c11cbcaa9f96f113c5eb1b875f887aa8835273af7e311ff4a46062e2f
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic to bypass gateway scanning by encrypting a payload, which is then likely delivered via one of the embedded URLs. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/strik?utm_term=netgear+wnr1000+factory+reset PDF link annotation
    • http://taxevidel.medianewsonline.com/how_to_pair_skullcandy_crusher_headphones.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/gone_michael_grant_online_book.pdfIn PDF document text
    • https://dumugukof.weebly.com/uploads/1/3/4/6/134647937/jutoxajem.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/massey_ferguson_3545_decals.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/symphonie_fantastique_5th_movement_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_6018be7993124.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/70385955013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_5ffa69cb32da7.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/pafegiselosuvuwog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3979cad96.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/how_to_upload_garmin_maps_for_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/upload_invoice_template_to_quickbooks_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/apk_blibli_versi_lama.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/indesign_cc_software_free.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/a_series_of_unfortunate_events_star_cast.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/70844382512.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/msrm_us302_wifi_range_extender_reset.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/zisop.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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 5376 bytes
SHA-256: cd73b2cb0c1ca692e671642dcbc2eb6981822f8ea74db2ceedf1996674c64d46
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10496 bytes
SHA-256: cda00225f8d2bba5d2417f1d916889c50974433d6bb7a075200d1bf09f0f7558

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