Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd538971d38cffd…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 17:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32efdc7aa6d43fbf710cd981528f1c0 SHA-1: d56c9480e7a14f392ab71d47e5184c7d9383b230 SHA-256: 3dd538971d38cffd9e1435e86110cae27d3c7e989ca5cab67cb2e597e06066c4
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

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://seumenha.ru/123?utm_term=the+invisible+maniac+1990+movie
    • http://katipef.medianewsonline.com/what_makes_you_a_good_team_player.pdf
    • https://static.s123-cdn-static.com/uploads/4447447/normal_60014ab0ebe73.pdf
    • http://zusiwibewire.mypressonline.com/weight_bearing_exercises_for_seniors.pdf
    • https://cdn-cms.f-static.net/uploads/4459791/normal_601ad452c3142.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/78552470019.pdf
    • http://jigitozunawada.66ghz.com/invicta_watch_battery_guide.pdf
    • http://vijexibat.mywebcommunity.org/harvard_best_cover_letters.pdf
    • http://zasazigupat.getenjoyment.net/2020_buick_century_owners_manual.pdf
    • http://nigoguno.scienceontheweb.net/excel_formulas_list_marathi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://laposul.rf.gd/vesamaxewodaligek.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_065ae6f1e1a24384abf6d1c4e9bc53f0.pdf?index=true
    • http://roveramo.atwebpages.com/vutopasupigawipajit.pdf
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_ae0df8a3cc3c47ab99403f326465b8aa.pdf?index=true
    • http://bopiguxa.atwebpages.com/gevul.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1ef053ffc19343b88d7c37ddd1fa881e.pdf?index=true
    • https://6f13f91f-8db0-457e-8d01-60a44fd2aa28.filesusr.com/ugd/cac9e4_70c90637925e486eb373cafd40921532.pdf?index=true
    • https://s3.amazonaws.com/zafijukopa/graco_solano_4-in-1_convertible_crib_white.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_fbb9246b4a61403c850b25bf4bd1f56f.pdf?index=true
    • https://s3.amazonaws.com/gatazeromij/best_android_auto_head_unit_reddit.pdf
    • http://ginowane.onlinewebshop.net/50714766187.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7a.bin
e090fb73ccf24fda7454e1e6ca41a476c38324e6a2c6d299c5a5151b514648f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5152 bytes
font_01_sfnt_off0000fbc1.bin
a372ef291ebf5f7a22d036bccc7aa22d6bd9ef8191345dbfcb42498bb234cfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10708 bytes
font_02_sfnt_off00012072.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 4324 bytes

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