Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac0cd6dab27c5c1…

MALICIOUS

PDF

82.1 KB Created: 2021-04-03 11:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3cec9e4c9f2c4e525fa7022de684d17 SHA-1: d26210d0df0d74fc84f69d46a1012c2b3afe79df SHA-256: bac0cd6dab27c5c17236b77620a5e16545d27e29ba792aa582f912b78956ba77
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to host malicious content or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/wix?keyword=adding+subtracting+integers+word+problems+worksheets
    • http://pezozolagipiv.22web.org/grammar_sheets_for_high_school.pdf
    • http://tapabafana.22web.org/42196436978.pdf
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/8cb0a9.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/6862734.pdf
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/4f92073a089f96.pdf
    • https://wapubepedud.weebly.com/uploads/1/3/1/4/131455956/0bd98cade6.pdf
    • http://fibubomalinod.22web.org/basic_english_vocabulary_with_tamil_meaning.pdf
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/xesutemapas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pegozegi/50575700316.pdf
    • https://uploads.strikinglycdn.com/files/fd61868f-b5eb-4210-a245-56dcbe0315c1/37956903227.pdf
    • http://fenozenexow.epizy.com/dobimilemepog.pdf
    • https://s3.amazonaws.com/xajowu/runescape_melee_training_guide_osrs.pdf
    • http://fadirejanebebi.epizy.com/jurnal_tumbuhan_gymnospermae.pdf
    • https://uploads.strikinglycdn.com/files/3fe05861-13a4-403a-a45e-0d0552262b15/how_to_install_gimp_user_manual_locally.pdf
    • http://pimusozulub.epizy.com/girel.pdf
    • http://mevutaleb.epizy.com/catafalque_kingsley.pdf
    • http://notavopanugatog.epizy.com/axcrypt_1._7._3180.pdf
    • http://ledojiwibobuva.rf.gd/caderno_de_caligrafia_japones.pdf
    • http://midexudotag.epizy.com/88942882571.pdf
    • https://uploads.strikinglycdn.com/files/d9ed5021-5c8c-4df2-889f-ba5cdbe3d3d9/guzeral.pdf
    • http://banobozibijur.epizy.com/danby_3.1_mini_fridge_review.pdf
    • http://natutepop.epizy.com/antibioticos_en_el_embarazo.pdf
    • https://uploads.strikinglycdn.com/files/1091d703-0fa9-4986-89db-8c2339d99a20/10656412457.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a5.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 2828 bytes
font_01_sfnt_off000101a0.bin
f40732d158b99eb71f897feada20201047d87ce1bcc88bdf8aa16478dfff7e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 5772 bytes
font_02_sfnt_off0001152e.bin
2899ebd8fdb97e7247a45656c8dfea4476b29b90ab2b301ceb88f3b080ec9dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 10316 bytes

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