Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ec65e03e6138ea…

MALICIOUS

PDF

91.8 KB Created: 2021-03-11 10:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 975f5509671aab61d9eb1d0347b05a07 SHA-1: 5e3059f16a9b043bf6abda2726fc09e955b75b2e SHA-256: 08ec65e03e6138ea8787a7bf41e93e29d00e9e809a3acd401bc2cd258ff9083e
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, with one prominent URL (https://vilenefex.ru/award?keyword=bsc+1st+year+analytical+chemistry+notes+pdf) appearing to be a lure for academic content. The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, suggests a context related to academic notes, aligning with the lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vilenefex.ru/award?keyword=bsc+1st+year+analytical+chemistry+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/suxujaba/y7hahi7/35861875881.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/math_shapes_worksheets_2nd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/Qphh0bk/2015_ncaa_football_championship_score.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/jbhaHV9/wezuvibonesodufu.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/bivozopajawa.pdfIn PDF document text
    • https://kugibiredatejag.weebly.com/uploads/1/3/4/3/134319346/dabadunetipeb.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/7ba7d5941.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/dopizufozitamamemikesos.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jiei5gd/positive_parenting_solutions.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/6347bc.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/heiiNhi/mortal_kombat_mileena_action_figure.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/great_granddaughter_in_spanish.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://pizitibasowu.atwebpages.com/22941597399.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_362c3ad452394dabb0ab474dc61fbd71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea4307-ca41-41d6-99cf-bb0074a86911/49410558593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2bb90f-7c37-4470-ae52-407e2f3486c9/spotted_lanternfly_eggs_on_christmas_trees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e4c938-666f-45a4-8eb3-b9f3d4a10690/bekiguvufifuli.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_a2658ede18324e6e84212eb062896c22.pdf?index=trueIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/62043799902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf926d24-4624-4a32-a763-ec9c255c5fa3/why_is_yahoo_my_search_engine_on_google_chrome.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_63fabc1400864093b5f351ab62597fc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eda80d-acfd-4d87-8c9c-4bb34852ad2a/jikovepivebo.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_a8ae0c52e17e4c949891b703c07dbab5.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 5388 bytes
SHA-256: 251f5e4cceb1d432ca2a1d37dc256855d94f7100a2c90adf25019df28bc0f513
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_03_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 10760 bytes
SHA-256: e91e9d700e5cde7d0ddc371dd3b5edfae5d420bfa9c045be0c4ed6486da911b3
font_04_sfnt_off000150c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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