Malicious PDF — malware analysis report

Static analysis result for SHA-256 934485f8d87a4a19…

MALICIOUS

PDF

79.4 KB Created: 2020-12-16 01:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 198670b7a338d2e13da92b7673583dbc SHA-1: ed2484dda5bf7ee4d6ce6e5ab859cd7f52012b08 SHA-256: 934485f8d87a4a19d9fbbeec5f42f85b3fcbf7a0c9b21a9d6870d5f51d43b887
104 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains an embedded URL that appears to be a lure for downloading an application. The document body, though heavily obfuscated, contains references to 'Remote mouse pro apk full version' and 'wkhtmltopdf', suggesting a social engineering attempt to trick the user into downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=remote+mouse+pro+apk+full+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389354/normal_5f91e85270a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8718afa5543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fb6a49c6296f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f9b854ccb0ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f9ecbcb53b64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fc59c039b58a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_5fbb21d683da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f87000280a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_5fb846abe5c66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/weaver_high_school_hartford.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/first_steam_tractor_1868.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/enable_jumbo_frames_on_cisco_3850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999d85f9-34d8-4586-bd23-a657b858f304/forklift_safety_training.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 3028 bytes
SHA-256: b0b96dee572144ea5c81147c361cb7c40db5cb2ef6e84dd5c403840cba3a1cef
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 5176 bytes
SHA-256: b4df14a6233814a063bbb6f7c4fefc598d63d9440f23fa49902d9f2f8bd8bc9f
font_02_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 9244 bytes
SHA-256: d1da7ab54a33880479ae1d69e7890d6dd20947874be9801b7ef30238a5c5afca
font_03_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 11592 bytes
SHA-256: cf33d7fc11113f039ff8bd58ede41e8b8cf5c4c782e51f33e8b5112120cb0cfb

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