Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf0aae61835e9f6…

MALICIOUS

PDF

76.4 KB Created: 2021-03-21 07:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dd70e8fb257c2dca652c9cb040b30db6 SHA-1: 932ec29e716faf3554344f2871c975972c59ac3d SHA-256: fdf0aae61835e9f6e430fb0c3a3061977ddf79e939f50a114fc6b9138f6ff44f
224 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and ML classification. The document body, though partially corrupted, suggests a lure related to customer service contact, aligning with phishing tactics. The presence of embedded URLs, particularly `http://helpcenter.business/14897136518k8n7r.pdf`, indicates a potential download or redirection to a malicious site. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=how+do+i+contact+whirlpool+customer+service PDF link annotation
    • http://helpcenter.business/14897136518k8n7r.pdfIn PDF document text
    • http://inmyshtangen.xyz/goravatejezedhmrrj.pdfIn PDF document text
    • http://nncucuucuc.space/radioactive_dating_game_answer_key_phet8hiix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_603ea1843e623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_604b278cae5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_602c0256413c3.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/wideluferid.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/family_counselling_definition.pdfIn PDF document text
    • http://cardio-natural.info/selekixuwuxunemubimilocm75m.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/zoxewudunigus/laseterazuvuxivapax.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_c9991a5bbf914cab81c36681565c5429.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/resuforuvigerikanow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96c34c4-7a9f-4cd2-add1-f512f3c05155/sezudulejusodogiperape.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_8616e7571c9b4f73b89ac6905f9cad5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/bosquejo_biblico_sobre_la_vida_de_jose.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/lodojiwoligigejema.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_d50057ec5dd147a88b7c22d260f1d261.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_15d6660b616348fcbd19c3f96376314a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1ff1bf-63f1-4d88-a57f-bf4339cb8170/92252466754.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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 5424 bytes
SHA-256: b286fca0d6ab87c9e777953036c0600ace461a805ef08f9abe7564a2883702ac
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 11300 bytes
SHA-256: 7839ac75b803e81e4dd1dbcb6b20cabb87ef87da0c3b751d5777a09c57171e60