Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae5bd000c0c056c…

MALICIOUS

PDF

69.4 KB Created: 2021-04-22 14:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7817a450747a52e5d2d7ac3756d7ccc5 SHA-1: 26ffe4ae7f034c175d3b80b3bae112579ca3c8d7 SHA-256: 4ae5bd000c0c056c00982800e3d4c0d57c178b66966f4fb9e30587bc6975c34a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'vilenefex.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a 'Stata tutorial for beginners pdf', aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing or downloader attack pattern.

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://vilenefex.ru/strik?utm_term=stata+tutorial+for+beginners+pdf
    • http://pewadulojuba.mypressonline.com/convert_to_word_arabic_free_online.pdf
    • https://cdn.sqhk.co/xevowuto/cjb1eja/incident_report_sample_for_fall.pdf
    • http://gitikirazidapi.medianewsonline.com/71732104369.pdf
    • https://cdn.sqhk.co/lamimegisu/cShan1X/movuxex.pdf
    • http://jaxorad.22web.org/jufutonit.pdf
    • https://cdn.sqhk.co/lexikegije/Nghgihj/dasm_epic_2_ar_effect_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sikuva/lavender_town_piano_sheet.pdf
    • https://uploads.strikinglycdn.com/files/62149efb-a54e-43f9-9a1c-b9bc5eef4a1d/nicole_brown_simpson_the_private_diary_of_a_life_interrupted_book_online.pdf
    • http://gisunomadipoxas.epizy.com/anemia_hemolitica_scielo.pdf
    • http://nanefelizili.epizy.com/baby_g_ba_110bc_manual.pdf
    • https://s3.amazonaws.com/rufonali/10611907616.pdf
    • http://suxotison.epizy.com/68260559585.pdf
    • https://uploads.strikinglycdn.com/files/29be2457-1727-4951-8f2c-384822fa4e17/scissor_lift_will_not_move.pdf
    • http://gomanezobovo.rf.gd/damudi.pdf
    • https://s3.amazonaws.com/faduxodiwo/ceph_vs_glusterfs_performance.pdf
    • http://bizurano.epizy.com/11359905266.pdf
    • https://s3.amazonaws.com/nemafu/58437043678.pdf
    • http://xenezipulugiji.atwebpages.com/singer_heavy_duty_sewing_machine_4432.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_off0000c691.bin
d94376e0dd9d0af6015b4e1a0b39c3a553ff72818bae28d6814e77f6eedbffd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 5336 bytes
font_01_sfnt_off0000d8ac.bin
d8e04ae6b0e945c47a9a7e3e411393e94ae7c7056072502c8cb4924c7f1f0406
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 9812 bytes
font_02_sfnt_off0000fa4e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 4324 bytes