Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b71f2ca9e7ecaa6…

MALICIOUS

PDF

275.0 KB Created: 2021-04-21 04:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: caf5a1353e0e5f403202db388bf136db SHA-1: d052ed4a2af5b1d289f34de16cd8277f3a65a874 SHA-256: 0b71f2ca9e7ecaa636733ce0495a4843014c16cf06180002fd227b0bb7678d76
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier also flagged this PDF with a high probability of being malicious. While the document body is heavily obfuscated, the presence of a malicious URL strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=andrew+wommack+books+amazon In PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/4156120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_6000e4412c317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fda42307ae26.pdfIn PDF document text
    • http://roduvogixaxo.66ghz.com/performance_test_macbook_air.pdfIn PDF document text
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/fawadovig.pdfIn PDF document text
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/4d4fe3d4efc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_60257240b228f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_605f6243a98b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fe8dea572e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/6IXgihd/60647343515.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/5537815.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/shflNre/meme_soundboard_ultimate_2020_mod_apk.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/3c8d59b3-70a6-4b9a-b745-737df931630d/rodirotitokudo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/that_70s_show_big_rhonda.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/dugetedixipilivopakelati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29409978-bd53-497a-aa6e-ed702b217523/what_jobs_does_geography_lead_to.pdfIn PDF document text
    • http://filujade.epizy.com/acorde_fa_sostenido_7_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d117c06-5ed7-4467-b1b1-e37e09abb33d/whirlpool_washer_wtw5000dw1_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a127a6f1-82a1-4466-9d7c-5b4bd39307e3/the_dream_of_the_rood_summary_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/does_gluten_free_affect_taste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71b8cbc-54d5-4b00-a40d-cc7421d564b5/59237767742.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/rii_i8_plus_mini_wireless_backlit_keyboard_review.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D848 3700 bytes
SHA-256: f14bfa202c5a9b8880f2bc735986ce48147b93f68890aead360271d32a1b730d
font_01_sfnt_off0003e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E57E 5048 bytes
SHA-256: d460f39e44f60dffc9e01dc51ccc71df051a6bfe744b3df3efd03824529d8d99
font_02_sfnt_off0003f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F68E 18780 bytes
SHA-256: a355635de57d3bc6f716593e279dffb767c9c6ba020eec3ae549e9e8a9898b5b
font_03_sfnt_off00042ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42EA3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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