Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a86372aababd93…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 02:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a866d728c09dcc81013775ee0bb514a6 SHA-1: c4d9269b04e2baf6a557b26385b14c426febafce SHA-256: 84a86372aababd930f4f83f4ab3df4e9bed2c2169752e1849c3f71efce3ce80b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://jacksth.ru/award?keyword=possessive+nouns+worksheets+2nd+grade+pdf'. The PDF structure and the presence of external links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/award?keyword=possessive+nouns+worksheets+2nd+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5fdaef0da19b7.pdfIn PDF document text
    • http://bonenipani.22web.org/26900935395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_60465123ea3a9.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/fumani.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/63441889872.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/27017979204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6045e83203458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_603dc1ff3db99.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/allahabad_state_university_ba_time_table_2020_download.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://sutexuvidag.myartsonline.com/banosakuviporuvosujupat.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/vampire_diaries_season_1_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/bspt_thread_dimensions_in_mm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867b2f5e-bb18-49e0-b926-29774f0a9a40/touching_spirit_bear_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0aba96-c585-40b0-b479-2a3aae46ae85/18741542172.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/4088464650.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/modalidades_del_acto_administrativo_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be6650e-8392-4e24-b996-cd36167e5a9b/american_gods_season_1_episode_6_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f227adb2-d6d3-4e5d-b33c-5264ca0482eb/36306909756.pdfIn PDF document text
    • http://vuropomap.epizy.com/10th_tamil_dolphin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/6197385450.pdfIn PDF document text
    • http://wojodine.rf.gd/which_conflict_resolution_steps_are_in_the_right_order.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/actuators_and_sensors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 5500 bytes
SHA-256: 0af89990cb030f014df3817316cf9787a1f68c7047e4ab644fad8d3d414aac04
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10664 bytes
SHA-256: 6a42926745212cca1cb7262a86528d081ac30668c1d2b3c341afb472cddf2385
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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