Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bff6e070d61adff…

MALICIOUS

PDF

74.8 KB Created: 2020-11-19 02:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 733b91f345f7278175d5743631510005 SHA-1: 3280fd747a36f4b89d6b4b716be0adb3f76dcfe0 SHA-256: 3bff6e070d61adff407526112a9046fac3a49109f874256aa36483630f0efc08
96 Risk Score

Malware Insights

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

The PDF file contains a URL that leads to a download, indicated by the 'unlockmytv apk firestick' query parameter. Heuristic firings and ClamAV detection confirm this PDF is malicious, likely a phishing lure for a trojanized application. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=unlockmytv+apk+firestick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f9fcd230ba9f.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/1216083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5fb0436165220.pdfIn PDF document text
    • https://korodovijexud.weebly.com/uploads/1/3/4/5/134512412/menan-dufenowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f9888ea68126.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/065fd.pdfIn PDF document text
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/banadajalulimipeser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5f906fc7c1ee7.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://uploads.strikinglycdn.com/files/1b418241-5744-4809-ab4d-d56501feda4f/a_very_big_branch_worksheet_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfb1fe4-6a07-4de9-948d-844459abf05c/vpn_unlimited_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0649b4-1550-4bd4-a481-98e702b4d87e/44531567023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca561e8-bfef-4e61-9a6a-a42cc01726fd/kufenarenobemoruw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5164 bytes
SHA-256: 2f856bca54fa25df5ee77d21e9d4bb30ddcbd58edaba1714ff7a8c42d64e65a0
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10788 bytes
SHA-256: 94b2c97978b71f02888b06fe8253a6c2fc76a913cdd0f7850d8ac0300ffff109
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e