Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7d2a2d84e0f3f6…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 19:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b50f6cfad712b51a82885807efe5979d SHA-1: 68a66b244800d65a47cffb7a354ff719a23f5e21 SHA-256: 7d7d2a2d84e0f3f6503b82ec90a6e185133f20c9703681ff1366217b0014211f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=powerex+mh-c9000+high+error PDF link annotation
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/wututefezelete_vujum.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/wewukudikofiwerunu.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/17701327395.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/how_to_clean_bose_wave_radio_cd_player.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/9862111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5ff5a36762894.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/marshall_valvestate_2000_avt_150_half_stack.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/criminology_the_core_7th_edition_citation.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/how_to_cite_mlk_i_have_a_dream_speech.pdfIn PDF document text
    • http://henrysavbr.site/course_1_chapter_6_expressions_test_form_1bfulqs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megigezorozo.atwebpages.com/gcse_maths_compound_interest_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/83938558577.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/buy_buy_baby_portable_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/39268833402.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 5284 bytes
SHA-256: b42fa151d29d9264f7410ee47d8d95566f5e347e78c9850b89f56e9efac20b3d
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 11376 bytes
SHA-256: 0966c1ae750327cc0dff861a3b60b95ff2d32c7a59951591c08db80932f2ed9f

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