Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ef2631d3a8ef4d…

MALICIOUS

PDF

87.7 KB Created: 2021-03-22 13:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0809ffd4009e047a9485fea793b5d5be SHA-1: 5a24fbf4ddc5145975cdc26c725c9fabf8f50c1f SHA-256: 10ef2631d3a8ef4d61e1d9a04d1f94cf40d815d3b7a243c4b4215b174a69a077
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with several pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body, though heavily obfuscated, suggests a lure related to educational materials to drive users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://dugedepap.ru/award?keyword=coordinate+geometry+class+11+iit+jee+pdf PDF link annotation
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/2415676.pdfIn PDF document text
    • http://intekzafast.online/mipodelugotude6gkd4.pdfIn PDF document text
    • http://xepezugabiposa.22web.org/niratax.pdfIn PDF document text
    • http://cookwellbakewell.com/vixuvupetedebiduzenorizgknd3.pdfIn PDF document text
    • http://instas.site/nabikixuwerikaremosezeq4tzn.pdfIn PDF document text
    • https://tivuwamivubi.weebly.com/uploads/1/3/5/3/135384825/vitotawetaf.pdfIn PDF document text
    • http://jusogowir.22web.org/business_studies_grade_11_essays.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/suxezanasuxidipobexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ratoweke.rf.gd/78294352178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747785d3-7b83-4811-bc20-63c3218e7740/namususikov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf54bb72-c208-4e77-9280-ff95d9efb5b5/how_to_interpret_ratio.pdfIn PDF document text
    • http://vuzozan.epizy.com/calentadores_solares.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_3d59d7bbdc7d4cf7936932fd47049a81.pdf?index=trueIn PDF document text
    • http://jilibozab.epizy.com/42486435676.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_4a1a213839ab47e0aecff48eb44d6bcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc375a82-09be-49e4-b55a-f87ff8c8eb94/21358589241.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_6b2d3e3cad7546c495600587a614256d.pdf?index=trueIn PDF document text
    • http://kekerojuxofex.epizy.com/85836772744.pdfIn PDF document text
    • http://notufexunu.rf.gd/irobot_roomba_flashing_orange_battery_light.pdfIn PDF document text
    • http://wuzafup.rf.gd/76583318169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43324188-db53-469b-b85d-5369b209fe7c/86719272574.pdfIn PDF document text
    • http://piwegotu.rf.gd/bahishti_zewar_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b9f9ea-e3b4-415c-a3e3-39f2d0fc8acf/panasonic_kx-tga101s_telephone_user_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 5516 bytes
SHA-256: f7f2a539e83e0ef149d50719940b57cc23d56336982880abf2067e19f7068e84
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 12536 bytes
SHA-256: a2c7197b7fcab6061ae7bc663da04929176fc2a2bc99111baccea3b6fdef0a4e
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2
font_03_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176