Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aaa06fefdb4c0d9…

MALICIOUS

PDF

70.9 KB Created: 2020-12-19 15:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dd14e38212092959b24ec68bcff0be5e SHA-1: b022b214cbf4034d4079895468751e7ccc03a6a1 SHA-256: 9aaa06fefdb4c0d95df0c46b45af9caa36c70ec1b8b5a578ddfd7078c5ca9c3c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URL that likely leads to the download of a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=s+pen+replacement+tab+s6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490269/normal_5fdb126c6cae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fcfe81853814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f91daaee9a5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5fcbef1818636.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/ruzumeb/nitapodipovilu.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/bimufinasovadedepeki.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/chromium_for_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/13451650618.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/casio_fx-991es_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/28577004908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f952b786-369d-4553-851e-33e06cb0e3a4/dopesigodal.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/aznavour_sheet_music.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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 5476 bytes
SHA-256: f84ef058f07f63ac1a36e0f5ff46119f60cb9968db996ed3dc4839273e656997
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10888 bytes
SHA-256: f50a76c40d020f9b08e2c577454335daf33ccd47ce63b726e77a145513f37cb0