Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29e371e2c5d912a…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 23:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0faa7d0fe66b4b284241efe158fcb36d SHA-1: 7cd73c6430482bbe463c66c2e71ada31b9f89919 SHA-256: a29e371e2c5d912aa4e96b5d4e38caf57b40cfb865b2afa0cb2949faaa81a1d4
96 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'opt out letter'. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitated the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=opt+out+letter+for+nys+testing+pdf
    • http://zaliv2k20wowowowoow.xyz/damizomokesitfxt9o.pdf
    • http://nature-ital.space/zijasozaduvulokilivomeswvcu.pdf
    • https://cdn.sqhk.co/karapazepot/k7CeoZ5/bamamozavotugi.pdf
    • https://cdn.sqhk.co/weretesa/jehaV5o/drawing_background_images.pdf
    • http://natiral.space/patton_electric_heater_parts6mkly.pdf
    • https://cdn.sqhk.co/xekejegixawo/cxx0hi8/street_fighter_4_download_for_android.pdf
    • https://cdn.sqhk.co/bagojenul/ifPk83g/vinasatikevu.pdf
    • https://cdn.sqhk.co/sewujuzanas/jj6OnEK/75981007094.pdf
    • http://reflectionss.space/defegosinetilowipizijuzoc76km.pdf
    • http://ponezivugatub.22web.org/fipud.pdf
    • http://anarchymedya.com/91959988948eehoy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/towutoginadivu/fefijusutusavuxepibeni.pdf
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_137c8cbdd9554ec4a6c0b0238699e368.pdf?index=true
    • https://s3.amazonaws.com/jugobimuraje/zipibozadujabumedajojofi.pdf
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_50321e41882b423f88d3f6e604854642.pdf?index=true
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_954e77d22b8d4bdc9558f41d611d8205.pdf?index=true
    • http://mujusamufi.rf.gd/love_poetry_books_download.pdf
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_a8ff54d5ba2a42498b1f5514e36f150d.pdf?index=true
    • https://s3.amazonaws.com/limepusotanal/monthly_expense_template_excel.pdf
    • http://vugopumoluzunu.rf.gd/vimodizesokanozemir.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_5b43db96423e46e5aa4bb58b155e83bc.pdf?index=true
    • http://sikejafomanama.epizy.com/5284838277.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/26794309528.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/papa_s_cheeseria_mod_apk.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_off0000ec23.bin
0c996112bea76ab65458c0c5687824039f6de2feecc9bdf56f4cca88d947d10f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5008 bytes
font_01_sfnt_off0000fd47.bin
f07020966c9d3574cebc0163065f895683e8c0202c3824ef643fc306267fc3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 11672 bytes
font_02_sfnt_off000124a8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 4324 bytes

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