Malicious PDF — malware analysis report

Static analysis result for SHA-256 486a19a416fdd15f…

MALICIOUS

PDF

89.3 KB Created: 2021-03-21 01:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea383c7f1cb9196ff6f45934d7b4dce SHA-1: 59f77569deaa8c5d19e882f4d49d4bc96235bcd0 SHA-256: 486a19a416fdd15f649c6ab7c90d5ed67c378a59afb108272d0018fa95ef6282
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jacksth.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to 'ultra quotes'. No scripts were extracted, but the presence of an external URI and the ML/ClamAV detections strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=finding+ultra+quotes
    • https://cdn.sqhk.co/bozawenibiwa/giihSGU/24622864791.pdf
    • http://merulabodonulu.iblogger.org/information_about_kashmiri_embroidery.pdf
    • http://vebilodugisugod.iblogger.org/80571826266.pdf
    • https://cdn.sqhk.co/fifapupifig/UvHSmif/77059179685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuzuvas.rf.gd/malayalam_movies_2017_link.pdf
    • https://s3.amazonaws.com/lewuli/bronx_tale_soundtrack.pdf
    • https://uploads.strikinglycdn.com/files/1e50a919-5d21-4a9e-bd67-d69d893dd3de/premier_protein_chocolate_powder_review.pdf
    • http://tugujaxozulir.rf.gd/cae_exam_sample_test.pdf
    • http://dudibagigop.rf.gd/cfop_method_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/b7e6aba1-8f36-4bc9-a226-28f55b85fd20/59417535194.pdf
    • https://uploads.strikinglycdn.com/files/005b8e28-25a1-496b-9589-236b2bf49123/33626692081.pdf
    • http://megunowibutik.rf.gd/convert_to_jpg_online_below_100_kb.pdf
    • http://lolofekigosot.epizy.com/wawokomovamefidid.pdf
    • https://uploads.strikinglycdn.com/files/86b4cbb3-ac67-4ea0-b740-769da30302e9/43259522893.pdf
    • https://uploads.strikinglycdn.com/files/96f97d3f-2fcd-4aba-bd57-570a00db0d92/30049883301.pdf
    • https://s3.amazonaws.com/wizakokowe/crpc_bare_act_free.pdf
    • http://xirasajizobopa.rf.gd/99342091616.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108be.bin
b3b9a985ae732bef3512676517fb07ede582d200a6ac08bebcca3f2701c7eb4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 5072 bytes
font_01_sfnt_off00011a0c.bin
fd2752dea0c096d0de3b62d092a8d4a7513c67502673bc99aa44056309516785
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 11488 bytes
font_02_sfnt_off0001417a.bin
f1707f52cd57085dccd4e547566cf2d6bf5a2bffecab67f70216a6058344fd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 16256 bytes