Malicious PDF — malware analysis report

Static analysis result for SHA-256 5758ffcc5f449b1f…

MALICIOUS

PDF

79.2 KB Created: 2021-04-23 19:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178b4a31152dbf05ce784113f045352e SHA-1: 27dcc3d3ba3e8f104ab76eb7186556b64ae1a9b9 SHA-256: 5758ffcc5f449b1f8b7051a5b681642c2a99e87647d5faf2aeccf8600c42042e
96 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 critical heuristic firing for PDF_MALICIOUS. An external URI, https://zajinet.ru/strik?utm_term=que+es+ficha+textual+y+un+ejemplo, was extracted, indicating a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to textual descriptions.

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://zajinet.ru/strik?utm_term=que+es+ficha+textual+y+un+ejemplo
    • http://migriruy.ru/2776995767zr0li.pdf
    • https://static.s123-cdn-static.com/uploads/4427103/normal_6005467ad2325.pdf
    • http://julubavixukab.66ghz.com/everstart_3_amp_smart_charger_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60323db0aba50.pdf
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff7eeee68792.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_601d764ab5353.pdf
    • http://pop-marketplace.ru/superficial_thrombophlebitis_accp_guidelinesi7b9b.pdf
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lelekon.epizy.com/66263294512.pdf
    • https://s3.amazonaws.com/fajujiju/proform_745cs_treadmill_weight_capacity.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_df5f41dc4b5b44a2bf22e255e1dc7f66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a188a0e6-7229-414f-9910-58f218204a92/what_does_an_it_system_engineer_do.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/76074500596.pdf
    • https://s3.amazonaws.com/tobobowu/18674666426.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2120f4b941f74948b2a2c5419d546875.pdf?index=true
    • https://s3.amazonaws.com/defujo/foruluvavuzefolowapip.pdf
    • https://uploads.strikinglycdn.com/files/04204963-c80a-4b2d-8c97-cbf3002882ca/el_hobbit_la_desolacin_de_smaug_personajes.pdf
    • https://s3.amazonaws.com/xepululejiwof/danujubumelenixora.pdf
    • http://maderenefozido.rf.gd/78894619332.pdf
    • https://uploads.strikinglycdn.com/files/3c420df4-629f-4e0d-85e6-e7b548d3df99/jumizenag.pdf
    • http://fuginifetulad.epizy.com/singer_sewing_machine_promise_1409_manual.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_off0000f566.bin
0c4464b5da15c84c132ea431507e773a15b057e812cdf61e2396af2dff71c533
pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 5464 bytes
font_01_sfnt_off000107f8.bin
ace5ab4fbefa71dfac6915732da44597081fb97f32cce1ef926bdf1e131105eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 12532 bytes