Malicious PDF — malware analysis report

Static analysis result for SHA-256 7990370c3f8215fd…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 02:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 774644d357f6d82bf4fa7f4cb6482a64 SHA-1: 6e224b2e85265d26f6c78ee1ad7f8fd031baad35 SHA-256: 7990370c3f8215fde8bc08b56985ba6a97bee7ae6fc48ffc654ceb8dd305cd0f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=human+reproductive+system+definition+worksheet+answers PDF link annotation
    • http://tk-time.site/99430991642inf34.pdfIn PDF document text
    • http://dutov.org/bukugazuguvovopifefiz7sqer.pdfIn PDF document text
    • http://eglo.club/one_punch_man_season_2_episode_13_tagalog_dubfzgst.pdfIn PDF document text
    • http://mipedinujit.22web.org/which_products_are_the_result_of_cellular_respiration.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/pcr_product_purification_protocol.pdfIn PDF document text
    • http://luxshop21.site/oromo_amharic_english_dictionary_apki14u6.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
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_1386eea2749942b5855dbac1cdeaabd1.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_69e54e90f0084ad988fb2fcec1b5f7cc.pdf?index=trueIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/bijapuwamezolisejaxuw.pdfIn PDF document text
    • http://pibagejebex.epizy.com/96266010923.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/ap_psychology_intelligence_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a2a381-545f-46d1-8b14-b136e272833d/25148704445.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/35655058955.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_bcd3e88564c14ae1a5719b5b6fe64a61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/19461113281.pdfIn PDF document text
    • http://fufibilola.epizy.com/convert_active_to_passive_voice_exercises.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/zotivuwupug.pdfIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_690a096fd44b47e1822a0aa5a85aae51.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_254b554e727d4607b4b6c8893943cee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f523912d-22c0-467b-90f5-9722bbfb9426/wekovojanedopedasorezu.pdfIn PDF document text
    • http://pepebejawu.epizy.com/google_analytics_certification_answers.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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 5524 bytes
SHA-256: d2decb62941f0648070c46c2eaed4bd03f902518ba19ea0bf85d1d74cd6419fc
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 11040 bytes
SHA-256: 03799601d9ee6364476bc33815ffdef7a32e43780bed0d85ec622a3f85af6e56
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c