Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b110c15e9f44f2…

MALICIOUS

PDF

76.5 KB Created: 2021-05-05 22:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61b53662ecaf5d049f67f2b06bb8dc2f SHA-1: 2575ae222a4dcce5b954b261254a429560206e3f SHA-256: b3b110c15e9f44f280d994fb2f6f10739f38e380137105435e4b19d0609ac66b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to learning Tai Chi, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+learn+tai+chi+on+your+own
    • http://derewopenila.22web.org/chogada_tara_full_audio_song_pagalworld.pdf
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/4599239.pdf
    • https://cdn-cms.f-static.net/uploads/4469101/normal_603fa680eaca4.pdf
    • http://bexemusu.mypressonline.com/jiroragoda.pdf
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/0931c6ed2b1010d.pdf
    • http://zakosemej.mypressonline.com/bagh_bhatt_ayurveda_books_in_english.pdf
    • http://sunazeremitiwu.mypressonline.com/download_al_quran_terjemahan_perkata.pdf
    • https://static.s123-cdn-static.com/uploads/4490547/normal_6007c2201a790.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bajapovogam/ruvujekawowiz.pdf
    • https://s3.amazonaws.com/xutomoxu/photo_collage_maker_free_with_crack.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_f4df76063f4a4a1492191c8ce48ce44d.pdf?index=true
    • https://s3.amazonaws.com/buganabowumujef/pdf_epub_to_kindle_tool.pdf
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_34406fc9b3f045c98d48eac4beee4ff4.pdf?index=true
    • http://bawozejowavonot.rf.gd/samsung_rfg298hdrs_xaa_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0d.bin
afebf1be8b405a4aa5f56abd1b61d428266b94526e58f111b8dfd0adbfacea25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 4864 bytes
font_01_sfnt_off0000fea5.bin
83412198486f4bb12977d1f07ed6bc6ddde2dad775239d803f3c1deeea2eccf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10932 bytes

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