Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f2f97f5c60bae0…

MALICIOUS

PDF

83.3 KB Created: 2020-12-27 02:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c042bc9631397a2bd14fefd89a554cb2 SHA-1: d0428ed6e09a326e0017f6935400d7dde193f3b4 SHA-256: 88f2f97f5c60bae0ef95ac92e3cdb868ff295b8c683d5b3b4ef645e4c4c18af0
136 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains an embedded URL that appears to be part of a lure, referencing 'best cordless phone 2019 with answering machine'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into providing passwords for archives, a common tactic to bypass gateway scanning. No scripts were extracted, but the presence of embedded URLs and the phishing lure indicate a likely phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://trafffi.ru/aws?utm_term=best+cordless+phone+2019+with+answering+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fc9a14f6de0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f8e8f8e2208b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_5fa661d8db87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fd1783643405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5fcc8d391ae4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5f9a2b69a8b83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77cec3f-cc29-4862-b85f-9b7e97eae851/9275160995.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/joroxugufesineno.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/78706292486.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/v_nails_la_quinta_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d6d371-d437-4f10-8049-e7e2506dfa16/wogobapinavusofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7125a86-3cbe-4ab9-894b-53751b78713f/90655842324.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/53431820531.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/baldomero_romero_ressendi.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_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 6108 bytes
SHA-256: c50787cf6b9eaf8dcd7775ee63fedaa7dd18511563d4507b55ab33db76f3a158
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 11064 bytes
SHA-256: d088cef26b63a08f4c2e79eefae646070d17c5d1978f6bd66a567534875312fc

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