Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e803bda611b30e…

MALICIOUS

PDF

74.6 KB Created: 2021-02-18 21:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 51729f250ecd48dfbd8b349bb2b3f5ad SHA-1: d11ad570ca154109765824f63dabec4922eb800c SHA-256: c3e803bda611b30efaeb5a95e2c0412eb45edcd908b16af075714759ed50bd3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the nature of the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=unblocked+4+life PDF link annotation
    • http://opencabinets.xyz/free_alabama_crimson_tide_wallpaper_for_android4tzwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5fee82898cfd3.pdfIn PDF document text
    • http://missunik.space/porque_surgieron_los_derechos_humanos_en_francia_y_estados_unidos1w95g.pdfIn PDF document text
    • http://jumovuv.22web.org/ameristar_warranty_information.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/cF5gesY/baby_care_play_mat_large_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490256/normal_5feef97d18826.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/OhiUbgg/train_them_to_cross_level_15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5fe1c3121e0d8.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://rolexewosuvasu.epizy.com/mamaferorikam.pdfIn PDF document text
    • http://tasobigadegef.epizy.com/indexing_in_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/29016213573.pdfIn PDF document text
    • http://gujupikisikali.epizy.com/wodiwam.pdfIn PDF document text
    • http://kotopofixivu.rf.gd/1683421205.pdfIn PDF document text
    • http://lakuxizutigevo.rf.gd/dental_infection_antibiotics_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/suxipef.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 4524 bytes
SHA-256: 592e09f7f9393cb0712eef03746be9506a9242a2d7e96890fed0bc576e48befa
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 10260 bytes
SHA-256: 6d93c43a2cfb6a2106de49c66bcd8d1ffe3eb90d2fc0b4ba50807fa1f6b0f859
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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