Malicious PDF — malware analysis report

Static analysis result for SHA-256 d581a18afde1c8c3…

MALICIOUS

PDF

82.5 KB Created: 2021-01-26 08:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df46cf4418410bfd371a1a5141c91c90 SHA-1: 614d02d04e2c1ac524b39eb6e4a88d473d9b4b4d SHA-256: d581a18afde1c8c324e9604b070852a141899205057ca1b0b7a860077ea01666
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Android auto communication error', aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/aws?utm_term=android+auto+communication+error+16+samsung PDF link annotation
    • http://firstreadersclub.com/ion_vacuum_pumpzraej.pdfIn PDF document text
    • http://vivofuma.66ghz.com/fokewisuzuvebenakel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5fe4041eecd10.pdfIn PDF document text
    • http://obzorov.site/84894901864xshtn.pdfIn PDF document text
    • http://sunny-web.ru/poultry_seasoning_on_baked_chicken6g3lh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5ffdf137c3f99.pdfIn PDF document text
    • http://businessmentality.com/wuramesofepudufaki13tk.pdfIn PDF document text
    • http://electrumwallet.buzz/kowadawunarezabajwptb.pdfIn PDF document text
    • http://devicesprotectionforusers.site/video_status_app_download_telugusscy7.pdfIn PDF document text
    • http://geniputan.66ghz.com/forecast_sheet_excel_seasonality.pdfIn PDF document text
    • http://sacredname.ru/85160737282lj28v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fdf9cd44e916.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/application_android_l_g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_5fe27e5178473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/letepaviki.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/97040115877.pdfIn PDF document text
    • http://roduteberilexel.epizy.com/tetawukapu.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/hollywood_adventure_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/pirorolozukaruzamimesuko.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/diagnosis_banding_bblr.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/chinatown_movie_english_subtitles.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5420 bytes
SHA-256: 1c5924f64603672ed525b08c4ee292b14b08ba9bfc16356a82c7a1dfcbcc3c13
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 2376 bytes
SHA-256: d4d200cc0f87203e01ddbf9598ceba881fd6df541ad72d3e7722d6bfae207985
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 11092 bytes
SHA-256: 7f048e36fb1b0a04754de58f9fcdf6aae2f85a1ede3d48c827a83eb06790d0e8
font_03_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16180 bytes
SHA-256: 8caa968e946bec887461fe4e6a0ecaa30738e2baf993c7c0a2b39022f0f5432f

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