Malicious PDF — malware analysis report

Static analysis result for SHA-256 115d71df6d5437d4…

MALICIOUS

PDF

209.5 KB Created: 2021-03-23 01:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f853e0a8a6bc4a2fcf15b6316438ca50 SHA-1: d5799623e435d638d8b8e9cd614a0e013e0fa31e SHA-256: 115d71df6d5437d4f5a0b13e43861ce76ac194682aa78339ef10366f0b60a04f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific ClamAV detection name of Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0. An external URI, https://leonvi.ru/wix?keyword=doom+3+strategy+guide+pdf, was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to a 'strategy guide', reinforcing the lure. No scripts were extracted, but the PDF structure and embedded URI point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://leonvi.ru/wix?keyword=doom+3+strategy+guide+pdf
    • http://the-english-temple.com/their_eyes_were_watching_god_character_graphic_organizer_tea_cakeqneaw.pdf
    • http://teplotronic.ru/jakigepobugifukixedagw6h6x.pdf
    • http://korogesubelokut.mypressonline.com/cuantos_centimetros_cuadrados_equivale_a_un_metro_cuadrado.pdf
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fcfa0b5c76e7.pdf
    • http://akfb.online/does_ut_austin_look_at_weighted_or_unweighted_gpathrfu.pdf
    • http://dejamorije.scienceontheweb.net/agility_ladder_drills_for_hockey.pdf
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60296e720ed20.pdf
    • http://streamsweets.com/56349020794oe1qv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebejos/dynamics_nav_2018_na.pdf
    • https://uploads.strikinglycdn.com/files/0f29483d-8d3e-4c97-9548-430fbfe545b4/savisobo.pdf
    • http://ledufowi.myartsonline.com/unilag_admission_list_2020_19.pdf
    • http://satovimowenijor.myartsonline.com/jogikodapunekabolozonevaj.pdf
    • https://s3.amazonaws.com/vuliwisuwig/jeppesen_airway_manual_asia.pdf
    • https://uploads.strikinglycdn.com/files/f46674f1-f8df-47a8-b690-ae06b4b69c6c/95720838499.pdf
    • https://s3.amazonaws.com/zedudo/ww_monk_guide_bfa.pdf
    • https://uploads.strikinglycdn.com/files/2c7c5edc-943c-4ff2-b205-305c0ffe37f6/segegiwotesukasewuke.pdf
    • https://uploads.strikinglycdn.com/files/64c01e95-6cbe-45fa-9e0d-f2145ecb7d5c/how_electronic_stability_control_esc_works.pdf
    • https://s3.amazonaws.com/wofaxil/7842926525.pdf
    • https://uploads.strikinglycdn.com/files/b6bc837f-e437-4d7c-af1c-86eda4c0f2e4/how_to_remind_myself_to_be_mindful.pdf
    • https://s3.amazonaws.com/wulotugadag/reportage_balkany_france_2.pdf
    • https://s3.amazonaws.com/dazawojob/fujodasi.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_off0002ff71.bin
21cd929f260a3a389a7bcc87bbec20ce2b26db5e34ebf51805c64f46a8830c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF71 5596 bytes
font_01_sfnt_off00031273.bin
548cbbb88c6f182e709f96ccd921d712dc42b4fe326104a1adc088fc5a583809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31273 11180 bytes

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