Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedfb8c37962b587…

MALICIOUS

PDF

78.1 KB Created: 2020-12-25 01:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ae2a5d883e929c836293f5aaf5dadff3 SHA-1: b8ad36efb3eb6ae5d0f762d19e8ef23405486141 SHA-256: fedfb8c37962b5870513daa40e996acd6a53d389f9e494055056b6d2d485bf20
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The presence of an external URI pointing to 'trafffe.ru' and a visual download button lure suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to downloading ringtones, which is likely a pretext for a malicious download.

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
  • 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://trafffe.ru/strik?utm_term=very+scary+ringtones+download PDF link annotation
    • https://cdn.sqhk.co/kuvapipitol/BpdjexE/giposonoduserusisitabigob.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/TLoqiez/6629138610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fa93dccd35aa.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/RXUweLf/75178990558.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/TLjg9o4/pabimiwubanunelixaludejar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fc2451eae473.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/Ogieghc/93795476238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8eaca900839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fe09961cda5b.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/kobivimelelo/ritipawawo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/luvez.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/sheridan_bath_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/cheque_book_request_form_bob.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_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 5264 bytes
SHA-256: 292735ab336d0c272bd5ba84194ca9491f9c4396cb43d3689cb8038c79617e05
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10536 bytes
SHA-256: 5bab17a6e8666bc508e743240f137b6b8eebfa8629b4ae0690dbfa9caa70c34d