Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd91ab25d243efcb…

MALICIOUS

PDF

74.1 KB Created: 2021-03-22 17:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8490ffe0e3e458c4a09c5c7a6584e207 SHA-1: d09cc37352d76751633eb79b43cec707d1df5ad1 SHA-256: cd91ab25d243efcb1e57420284ad033ee2d1e848ef70f2ad6ddb5201255533d1
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, indicating a high likelihood of malicious intent. It contains embedded URLs that likely lead to further malicious content or phishing sites. The document's content, though partially corrupted, suggests a lure related to an 'estimate quotients worksheet', aiming to trick users into visiting a malicious URL.

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://nipisod.ru/123?utm_term=estimate+quotients+worksheet
    • http://topchambre.xyz/the_real_book_of_enoch9wijb.pdf
    • http://nubolutlion.xyz/intel_dx58so_bios_downloadnblh6.pdf
    • http://decideyouself.fun/wanted_full_movie_download_in_hindi_dubbed_hollywoodtq4zb.pdf
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/wutewifefos.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/zixerujixi-pogelazizagu-wugexekovatek.pdf
    • http://ozalupa.space/pathfinder_bestiary_2_download_freex55ah.pdf
    • http://fimewot.xyz/breadtalk_financial_report_2016kxxkv.pdf
    • http://mx50off.pro/pokemon_sun_download_time6rysy.pdf
    • http://4d-5d.com/11376318550wa3jz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nisanasedupava.epizy.com/automatisme_et_rgulation.pdf
    • https://s3.amazonaws.com/jawusawar/fepobap.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_b6f60fb8b1fa449e877d234b80e8706c.pdf?index=true
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_41678e69dbb64e55a540245f5283f221.pdf?index=true
    • http://dojeranorered.epizy.com/60086550413.pdf
    • https://s3.amazonaws.com/legapatatezisa/vorunofogidimexilamubupot.pdf
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_008524ee0e8148e185da485c2d33ea10.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/47431575142.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_off0000d52f.bin
03e8a04fbf815f5bc31c50bdc89a7a322947398a13cad33a853094b9d62946f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 5012 bytes
font_01_sfnt_off0000e61b.bin
d7f594d83815828b0ee653df33da513113adbdd9913771d1288b5e99b6720792
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10980 bytes
font_02_sfnt_off00010b89.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 4324 bytes