Malicious PDF — malware analysis report

Static analysis result for SHA-256 a640a9e5f30afdf4…

MALICIOUS

PDF

79.9 KB Created: 2020-12-23 04:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0da9c12d0757f5d9914c7e57ea4b8b08 SHA-1: 9914b6c807e8f6e45a6f5365dcd77420ba21b3ab SHA-256: a640a9e5f30afdf4168c4e24afddcfac779a22620d0a841a4d8ade562a2eb2dd
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The presence of a visual download button heuristic further supports the malicious intent of luring the user to click and download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=toy+defense+fantasy+td+strategy+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5faa405fc80f8.pdfIn PDF document text
    • https://vagifobulipap.weebly.com/uploads/1/3/4/5/134595928/jakamedalo.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/gomidabo_kozafozotid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5fa03409722c7.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/351dbd8.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/994983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gajakelegeza/heat_and_thermal_energy_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4314456c-2add-485e-ac6a-5c4a3adc7f8d/87703811672.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/blender_guru_shortcut_keys.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/information_acquiring_and_sharing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6c01a1-1c2a-4cd0-837d-87f2eb37c1cc/geometry_final_exam_review_answer_key_sem_2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 4984 bytes
SHA-256: 34af4dd80db2615783d4eeebff1f1cd32cd316562047ddf8c1017fbbc0a00cc5
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10580 bytes
SHA-256: 5637d7a268d4f1015bca1fe5dbc7d12dcf5caac56f0eb1a0a6e23d6ad2ba5c7f
font_02_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 17228 bytes
SHA-256: db950ec670c36745b36f670c5ff7a4d56ed0f8d05ba2f0006ae6814480450d28
font_03_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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