Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad658efd8e5805…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 23:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4664107a4572d27ac7ebf08dc79e524 SHA-1: 733cfed37bc55aa0574b8c6fec2cfa73a8df55eb SHA-256: 40ad658efd8e580540856666befdf15727da03b7e9ff528ade806fa1d61f0da6
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high-severity heuristic indicating it's a password-protected archive lure. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and heuristics point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/award?keyword=como+incluir+assinatura+digital+em+pdf
    • http://netowamuj.iblogger.org/7464608964.pdf
    • http://fodosokidorakig.22web.org/mcculloch_eager_beaver_3.7_ci_chainsaw_manual.pdf
    • http://pabukelib.66ghz.com/jimopuzuso.pdf
    • https://cdn.sqhk.co/navuwamas/PjagiiW/mini_game_project_in_java_with_source_code.pdf
    • https://cdn.sqhk.co/duwefetufe/jjhjhe5/62105701137.pdf
    • http://bonuwefuganagus.22web.org/oracle_r12_iprocurement_implementation_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ponadik.epizy.com/xabusanomudu.pdf
    • https://s3.amazonaws.com/ravuxudibure/66815865689.pdf
    • https://s3.amazonaws.com/sedowedi/sareg.pdf
    • http://jupetovujek.epizy.com/39325982291.pdf
    • http://dalelotagu.rf.gd/fufido.pdf
    • https://s3.amazonaws.com/tobovunoberiki/jinavodosanolomunutetuxe.pdf
    • http://pufaperimixalet.epizy.com/2985492786.pdf
    • http://xazemonubof.epizy.com/how_to_make_a_mini_comic_book_step_by_step.pdf
    • http://gulavofi.epizy.com/the_counting_principle_worksheet_12-_1_answers.pdf
    • https://s3.amazonaws.com/pajeriramal/wuribewafixiliva.pdf
    • http://lekekavom.epizy.com/how_to_replace_magic_chef_oven_heating_element.pdf
    • http://vedezanopade.epizy.com/47748965689.pdf
    • http://zalezir.epizy.com/rofivetonuto.pdf
    • https://s3.amazonaws.com/pulujolatepuv/rewepapenekafewiw.pdf
    • https://s3.amazonaws.com/risisipajole/787738954.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_off0000e9ab.bin
7d844a83eacfb6567db02debbf54ca224d8d2bb250b01a350433bd6d538641e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5380 bytes
font_01_sfnt_off0000fbd9.bin
fa45bf4a18d97b72e937268413f565a9f18dce6c22e7e302cda4d02f46f1f36c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 12776 bytes