Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9dee26778903d9…

MALICIOUS

PDF

65.1 KB Created: 2020-12-03 18:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 844aa4434c390feebff11e48710738a5 SHA-1: 1b2dc3b7f1a70769a6696b08986ff4a99d828457 SHA-256: 5f9dee26778903d991b1d6966cf7f27598b9c1af0c3f48b1ce8ea91f3b099cfb
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'traffnew.ru', which is a strong indicator of a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, suggests a lure related to 'transition words exercises worksheets with answers', which is likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=transition+words+exercises+worksheets+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f891df2e60c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf73a4f98375720a61b5b/1606285115470/arduino_analog_input_sample_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/how_to_cite_a_dear_colleague_letter_bluebook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c991c6d9645836219624/t/5fc0df4e5147b1480453e2ed/1606475599963/95306660861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3171ac3f-4495-4824-8786-90817947e2ae/sarekadinilugugoziwajogi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4fbdee5c7695ca9b5b589/t/5fc8e6a912b56f2ae7cdcac6/1607001770582/tapivujulapegizorakebuki.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0879da3bf4b14aba759f2/t/5fc0dfda9d79364840add634/1606475738485/airsoft_pistols_holsters.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18950b8467722f1d8bdf7/t/5fc527af3c6ccf69f3047e44/1606756291924/60016809066.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/94213272412.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/associative_mapping_in_cache_memory.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_off0000c16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 5168 bytes
SHA-256: d5f1986057b4c31ad1aead5cc0b23dce52bebffba1b0e937788e974393fdb3c2
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 10864 bytes
SHA-256: 492f50aae1359017144b7231d717bdf0eaf80ed2a452631fcabee45d08efc2f5