Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c47835869e24cdd…

MALICIOUS

PDF

76.3 KB Created: 2021-07-12 21:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95cb1965b6c18f4fb3670cfe98ef5d37 SHA-1: 5d91cc72466568cbe0cd752e4d2849e4c659c2a5 SHA-256: 3c47835869e24cdd74f8f9214cae81b21919fd95483c764099437db0aa5a4022
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'cructi.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/square?utm_term=how+to+convert+a+word+doc+to+a+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e838e348fdc2594044f7bd/1625831651541/fitawaxufixisijuta.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7da97726b430b467a24f/1626111401761/45175793074.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7a0af89f8e700bf677a6/1626110474958/baby_names_that_start_with_g_for_a_boy.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d66e38670b5817c4c662/1625871982314/self_crucifixion_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7fa93f7a034ccb7a3d58/1626111914182/homeopathy_medicine_for_immunity_increase.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e948718915684aa53e6fcc/1625901169736/ruzasapibuxo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f33b3b7e7c63344e262d/1625879355314/current_fads_2020.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec78c95978cb5ccaa9b798/1626110153550/data_structures_and_algorithms_aho.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92b588fb24157da70752a/1625893720389/daruraxinalakefivesof.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec786c154eb17b6848e455/1626110060260/liver_ast_meaning.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://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_off0000c921.bin
d17ab3ba4c817b881a79d1b9909ec38ec928c7032a91f9c0c27e7a33dc6e0df5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10448 bytes
font_01_sfnt_off0000e0f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 16792 bytes
font_02_sfnt_off0000f90a.bin
cdb0bd9e09c43351fe6bed0ff07761d51b4452d4d005079053f0ecef5566be17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16732 bytes