Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5941dc4ebc0db7…

MALICIOUS

PDF

91.4 KB Created: 2021-03-31 15:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de24e9d0c087726ea09211bd9fae481 SHA-1: b7ae2acca1046d2d8de47a2d924a7aa1a7de77bb SHA-256: fe5941dc4ebc0db7afa4dba8b5cf75f425fe522dc4e3f2688633e1bb4b62ba12
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, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, containing numerous external URIs. While no scripts were extracted, the embedded URLs suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://botokaw.ru/award?keyword=9th+grade+math+practice+worksheets+pdf
    • http://karnaval.host/fumaja8x9jl.pdf
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5ffb1dd928192.pdf
    • http://firstdoctor.xyz/acer_aspire_one_zg5_battery_repairkxnnb.pdf
    • http://golden-bridge.pro/chamberlain_liftmaster_professional_1_2_hp_manual84501.pdf
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fe9906953fed.pdf
    • http://my-favshop.online/cells_alive_animal_cell_worksheet_answer_keyq0wrb.pdf
    • http://vikiduxa.mywebcommunity.org/alias_grace_full.pdf
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/2592168.pdf
    • http://lianhua.life/5076285512l23mh.pdf
    • http://nakrutkavk.site/memunazubujini44a0.pdf
    • https://cdn-cms.f-static.net/uploads/4417214/normal_604a12abcb086.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/9989019.pdf
    • https://saritubix.weebly.com/uploads/1/3/4/5/134507132/dbe469da966.pdf
    • https://cdn-cms.f-static.net/uploads/4488556/normal_5fe6441448678.pdf
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/lagajubar.pdf
    • http://palitra-cveta.ru/6250926630qxytn.pdf
    • http://natosabi.mygamesonline.org/40363622747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3dd3554e-50bf-4d3e-8e08-09768dc9f352/gimoni.pdf
    • https://uploads.strikinglycdn.com/files/90bdd53d-da8a-4f7a-b42f-f8e6e0116f4a/15943971660.pdf
    • http://dapibudajemuk.atwebpages.com/200_business_ideas_in_kenya.pdf
    • https://uploads.strikinglycdn.com/files/a9881004-4975-4f91-8bd3-c08abf46487c/give_examples_of_simple_and_complex_carbohydrates.pdf
    • http://najijojovigom.myartsonline.com/acing_the_interview_book.pdf
    • https://uploads.strikinglycdn.com/files/d00add22-4dde-44ce-bfd8-84ced12e73e4/is_adjudication_the_same_as_arbitration.pdf
    • https://uploads.strikinglycdn.com/files/0c15c20f-a61a-4cfd-bd85-b3d2db7d4546/31955165371.pdf
    • http://fuvamawijivef.atwebpages.com/87835886543.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045f.bin
2c36b580d49bffd0932a045c4aa7a993a714648e59b10eb08b7d93ac3cccb828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 5756 bytes
font_01_sfnt_off000117de.bin
6e2057e8ec73eca5b0bdde74775db80f5f8f499a330daebc0a2af7001bf6367e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 2536 bytes
font_02_sfnt_off000122c1.bin
d40fb70d958eab1e407d42673b29a4c4fd8de4e8d752af99bf383474b5e26dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 11568 bytes
font_03_sfnt_off00014a39.bin
9fa8bf34b392e54777a73878461b2c201b7cd697526f69512042a84d0f933758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A39 16096 bytes

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