Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada53fae44b9c95a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-14 23:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c32ea570b74d2bd28f6ca3cc030cc474 SHA-1: 79f49b073e3d118d20fcdebfacec6058c20b6867 SHA-256: ada53fae44b9c95ad647d3720fa79af03c7f7014b9ae29e280758eb3449b0a32
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body's content is obfuscated and likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=cuantos+libros+tiene+el+antiguo+testamento+y+el+nuevo+testamento PDF link annotation
    • https://cdn.sqhk.co/nemovofa/kfxgBgE/free_online_medical_books.pdfIn PDF document text
    • http://espacecmb.xyz/50124857539e0f8i.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/115276680597n1vl.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/rzwgfck/mukaw.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/vegitax.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/70OghLo/puwagavovulo.pdfIn PDF document text
    • https://cdn.sqhk.co/sejaganetaxa/jihgcyX/black_background_hd_wallpapers_for_laptop.pdfIn PDF document text
    • http://delaem-sami.online/what_are_the_functions_of_law_in_societyzytuv.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/15ed5caff0.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/sawemu_votuwelu_zufiridu.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/Xib9jgd/space_hd_wallpapers_1080p_for_pc.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/nomumek.pdfIn PDF document text
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/midijefomuza.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://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_202472ec235b434cbf8e05f39e62bfc9.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_7946367a72cb46f1952b28037cb741df.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_6146dc1fa1814cffa8ebf0ebd3a581a7.pdf?index=trueIn PDF document text
    • https://f22a9904-e884-4e4b-b219-c70c7d184214.filesusr.com/ugd/a298ce_bcd7073ee56e436f9d91c5e55da92668.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_6c7d9e6af1ee43e7ad91fd349cfcba0f.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_eb4054bceb5e41b2a3c4994c0d2a9456.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_93ff1454e7fa467f9965e96ae2af418c.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_8819ee92f1c148adbe92a3f292e8e987.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_b9bc6101380c48f1b6c6059ab8063694.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_7520bb7895754ed797c84b32c26c7046.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5212 bytes
SHA-256: ae15c3c4854a4e19008174f4013a131b99fa7be40c8a368e60860b9311a853a9
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 12076 bytes
SHA-256: 3abd79a8e73aff94f7d21aa11dbf7eadfa913f3f20e569034beccdc6065e6b85
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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