Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff91cfd7391e0c…

MALICIOUS

PDF

73.7 KB Created: 2021-06-04 03:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6974457030669e6582991531d986d165 SHA-1: e1d3c5d5cb770d3c4b3c45168541a0ad7a816a7e SHA-256: 3dff91cfd7391e0c31efe7291c63760a1cd950b09e1130d29c5add1d90bb751f
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'drafthe.ru' suggests a phishing or download lure. While no scripts were explicitly extracted, the PDF format and the 'ML_NYX_PDF_MALICIOUS' heuristic suggest potential for embedded JavaScript or other exploit mechanisms commonly used in PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=simplifying+fractions+puzzle+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5fcd20c7153c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_6035a33a38bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5fc5c53543b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_605ee2f0c41b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_605d7562466fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_6030458e30904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_60694a6c87cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_60329b4b21543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_605684188fbbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fdbd0ffe5157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd9d6da4cbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601e018262382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_6063d3712e108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_603b22cb16b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_602bb20edc11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_60103f581d4a3.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/6add52bd-88a3-4770-b610-ee09bf08d35b/20961646616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b6e7ec-7314-4bc8-9237-adeacdbcaa03/carbs_in_taco_bell_taco_salad_no_shell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d996668a-acaf-45a2-b912-cce736306877/83694576532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1efde1-7ab0-4772-b62a-a427349a36a7/rudefemarumewepoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4672ec-445e-4afb-ae97-12ca845ece07/graco_x5_vs_graco_x7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4cbeb2-3259-4dbe-81e6-72889d576e5a/last_of_the_mohicans_streaming_vf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e3c320-af3b-4537-ac8e-c63bf5c954a0/what_iso_is_polaroid_600_film.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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 5980 bytes
SHA-256: b17c99040f61b0b2e15dff7f79cfb61b9884a67586a3dfd791e85572fbcd0d51
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 11436 bytes
SHA-256: 60776c31c1af3bd0349ce4e47a164c0079ba8bdb28c7f35a7156bae603adc9ff

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