Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e619324ff283b5…

MALICIOUS

PDF

76.6 KB Created: 2021-01-20 00:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73a3f6f1f9301963ab6da787a93b982f SHA-1: ac7e55642f5d18a4ca65c04ede56f350eca0fc20 SHA-256: 28e619324ff283b50329cc55015de73c6c1c6a74cf33664145805a9f1d2aa901
126 Risk Score

Malware Insights

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

The PDF 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 'baarspo.ru', which is flagged as a disposable hosting link farm. The document body, though heavily obfuscated, suggests a lure related to a "dungeon boss cheat sheet", likely a pretext for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the nature of the heuristics strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=dungeon+boss+cheat+sheet PDF link annotation
    • http://dedarijaluwonu.22web.org/96584875739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5ffbb73709856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_60001b827fba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5ffc994e5cb4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fa1415dbec02.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/20dcb27b8d8fdf4.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/6676822.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/acrylic_nails_near_me_price.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/35bc490306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_5fb9d3046a99b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5f978f666ca5f.pdfIn PDF document text
    • https://site-1177565.mozfiles.com/files/1177565/insuficiencia_cardiaca_sintomas.pdfIn PDF document text
    • https://site-1178425.mozfiles.com/files/1178425/equalizer_2_cast_bearded_guy.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/cardiac_catheterization_coding_guidelines.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/lukepepe/hayward_ec40_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/taguxegep.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/kotawijikatoditilikep.pdfIn PDF document text
    • http://kikidexawudipox.epizy.com/lakisakunasu.pdfIn PDF document text
    • http://jiwerefupuz.epizy.com/rekozipekimezukitutuvog.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/75432913432.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/happy_birthday_coloring_sheets_to_print.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_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5072 bytes
SHA-256: c9fcb6923eae2781a8c8a9869f3f8a6da3a93098ad9ff7c490d5e6223603fd59
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10780 bytes
SHA-256: c14e84fd1ae971c5b2ea72f03671971aff72c0e3858e902894c04eb512b473ca

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