Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d6cec6645d7d3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 14:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 33f589f66083714cca86e9dea4bb3c6b SHA-1: 43d6c88b8aa595a623bf2105fde1989837119d20 SHA-256: dc3d6cec6645d7d3460564779c848c09350dab549cdade6f9c3d85ea8f241a93
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to an 'Infiniti q50 repair manual'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=infiniti+q50+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457847/normal_600b58e73de3f.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/951824.pdfIn PDF document text
    • http://reduslim-shop.site/the_solar_system_quizleteroxn.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/6161702.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/dapozuwilama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5fe962f084f21.pdfIn PDF document text
    • http://esmoney.site/timilozofudezasilaratadabewbig.pdfIn PDF document text
    • http://reborasiruv.iblogger.org/takealot_app_free.pdfIn PDF document text
    • http://swiss-gear.shop/why_is_my_vape_mod_not_chargingf1aij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_6044f8469bd82.pdfIn PDF document text
    • http://wizagulonas.22web.org/maze_runner_1_full_movie_download_in_hindi_480p_bluray.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_600210de65199.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/kobivimelelo/bracket_malo_free_video.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_2e899c1a7b124e58b2571c010ffe4e8c.pdf?index=trueIn PDF document text
    • http://webubop.rf.gd/pronunciation_of_tempus_fugit.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f25779d3a6794c64b855a01dee23bbed.pdf?index=trueIn PDF document text
    • http://pamerugug.epizy.com/countable_and_uncountable_noun_worksheets.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/24552708704.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/steel_division_2_infantry_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/twisted_pair_cable_categories.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 5196 bytes
SHA-256: 354c5cd1087dce5284a3b755143240c30b66ed5e35859d495dd19c6be2ba1a95
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10888 bytes
SHA-256: 5a1c7e61f03aee3068d7f48cdec1ae456bfd862161afb52c8618c680d8e78e71

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