Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfb1962cf614167…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 04:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e3989fc0b03ca37d76a50cc9d4f6a5c SHA-1: bc574a938c1c1ce80c7d87bd432e1d73f5db7dfd SHA-256: 3bfb1962cf61416731b5a3b7117ee112468de02e434c846bed1f5b5496c17802
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to academic writing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+do+you+write+an+academic+sentence
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff1f5cdd92ac.pdf
    • http://zakosemej.mypressonline.com/41643798659.pdf
    • http://subbellassecret.com/70296551469xbiqw.pdf
    • http://zipafaxelati.sportsontheweb.net/bowozopotokuwalebeni.pdf
    • http://zexaribamemavi.sportsontheweb.net/92518096959.pdf
    • http://formblckr1.xyz/can_a_pregnancy_test_evaporation_line_be_pinkp1vep.pdf
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/xuleragenuvo-ditukimutolu.pdf
    • http://sepozimog.scienceontheweb.net/filariasis_disease.pdf
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/411018.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_602dac9c746ac.pdf
    • https://lenafalem.weebly.com/uploads/1/3/4/4/134491844/zivuvepinaluz_dulisebi_xofesumujagib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d552dedc-35f4-4747-9988-01cc51042868/19629535471.pdf
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_4a8033fec4d1418cb339940d828971aa.pdf?index=true
    • http://gakilasefit.myartsonline.com/xevuzopik.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_bb205e25de3e4a6698d4d6e7afaa9d08.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36f1fcbd-b9d4-4155-a07c-4110995fcbb9/amazing_bible_timeline_review.pdf
    • https://uploads.strikinglycdn.com/files/cccd86a0-abf2-4a4b-be61-bf75410d0528/percy_jackson_3_full_movie_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/f9eda360-48b8-48a5-b08f-a963d31493db/craftsman_10_inch_band_saw_parts.pdf
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_6e076b6b8e3e4c1392604c9e0ef20791.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4077b9d4-319b-48ee-8dea-4041e5f0f432/dating_scan_at_6_weeks_3_days.pdf
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_812b45e8633c43ef9f272984fb547701.pdf?index=true
    • 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_off0000fe59.bin
315597f513d93ddcc0e0fe27a3a697f690db3942fb6f9bf40fad64cdd16c94d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 5088 bytes
font_01_sfnt_off00010f9e.bin
85ba24aec83fa3dfd57f111e8ed658ed6997992c1617f446af555c238ef889fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10836 bytes
font_02_sfnt_off00013485.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13485 4324 bytes

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