Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3fc110692e451e…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 08:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 51f506e223408b395d8620defc775b97 SHA-1: e5beb3188c683430c911b37223a8069d841d3729 SHA-256: 9d3fc110692e451ed8abaf21f46694e8c8d3846fb8f1b1f4469217db48337ea9
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://baarspo.ru/strik?utm_term=hp+cp1525nw+maintenance+kit', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, suggests a lure related to printer maintenance, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=hp+cp1525nw+maintenance+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5ffc64e74c5ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/dIYjhhi/84906349090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fe9af52b3c3a.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/F0ZFieP/talisman_origins_the_eternal_conflict.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/ejBvijp/orbit_playing_with_gravity_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/CiiVEgf/carrot_fantasy_game_in_android.pdfIn PDF document text
    • http://xofutumokegabix.22web.org/84030180170.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/Wichcgc/labyrinthine_synonym_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_60212a5c63870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fe872dcb5e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602d946c933e3.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/JibIF0s/falarazunobek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_601be2f0455d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5fde5ee35c611.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/hdahjSn/kofopezixim.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/kefodek/30053864857.pdfIn PDF document text
    • http://vugofixev.rf.gd/forma_plural_chitara.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/bootstrap_4_modal_reset_form_on_close.pdfIn PDF document text
    • http://vizebafep.epizy.com/biochemistry_laboratory.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/google_play_store_on_samsung_tv.pdfIn PDF document text
    • http://vetanafajodomek.epizy.com/watch_the_hunger_games_catching_fire_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/gobivupogaginesupar.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 5196 bytes
SHA-256: bc898e0eae72e4586a662ecd21782e247c2c75066fb39f148ac2f0383348cba6
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 12788 bytes
SHA-256: d7fcea582fc136da05dfb65551fbd7193aba6114350efd026e8f43baea090d8a

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