Malicious PDF — malware analysis report

Static analysis result for SHA-256 de721b96d41bb3ee…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 13:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d99eb39c9dfde3113fa768a2367f9418 SHA-1: 98bddab20e707b557d8a901bb917be50b225b257 SHA-256: de721b96d41bb3ee0b0c2ec9dd24e10d7585bd21c96090c1b250b04d82fb7d38
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF structure and embedded links suggest an attempt to trick users into visiting these sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=gmail+android+select+all+search+results PDF link annotation
    • http://duxojiz.iblogger.org/how_to_study_for_the_aswb_bachelors_exam.pdfIn PDF document text
    • http://hyipinvest.site/rigixezabefobemelizesa2sdwh.pdfIn PDF document text
    • http://starconflict-game.ru/rulobomzcdj.pdfIn PDF document text
    • http://imedo.ru/parquet_courts_human_performance_liveig8wn.pdfIn PDF document text
    • http://construt.site/99085281306kgboa.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/fanuc_cnc_lathe_programming_free_download.pdfIn PDF document text
    • http://ersoil.fun/para_que_sirve_magnesium_citrate_oral_solution6p9m5.pdfIn PDF document text
    • http://copyright-security-ig.com/69573148315h7sb4.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/effective_business_writing_strategies_and_suggestions.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/gijilidasog.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/movedelawegobaziz.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/62686699343.pdfIn PDF document text
    • http://hamsterbig.com/39335958884naai2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_325aede63a1d4081bc3154e5cac802b6.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_1f4504360ce849429648fbd11c234e8e.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/wolaxibavesugokoguragana.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_53c17ea0c2964557a5bfc90d9919b9d5.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_b5817bf219284ee987278a6bc7eade1e.pdf?index=trueIn PDF document text
    • http://zosonigileg.rf.gd/wewitoraf.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_09f54ba30c394d6db936f420c31abc4c.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/70125399450.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5212 bytes
SHA-256: 0b03eb954aa8e294aa1a66a5934a0847c4ab0a699e4a2f731318f71bad44737e
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 11172 bytes
SHA-256: 02d19ef5a3b64f246746874a7fd35eebdda38ea0653d57986571e03505be2d01

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