Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa7df91850cf3a…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 10:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7b70db1ee16b2cfd8156aaad592816ee SHA-1: b509dae88c847a3b1194f33e46ce1840eb3a483b SHA-256: 54aa7df91850cf3a428564425c750a79350c1d1a4093679c217e543f9e9936c1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=talk+to+me+in+korean+goodreads PDF link annotation
    • http://chategratis.online/telugu_movies_2019_3gp_mp4bticr.pdfIn PDF document text
    • http://sallehub.xyz/92154319944okxuk.pdfIn PDF document text
    • http://natfreshik.fun/gizmos_student_exploration_water_cycle_answer_keys3swq.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/vamutefijuwuro-kijetuxifunobe.pdfIn PDF document text
    • http://xtina.online/green_smoothie_for_life_jj_smith_free_downloada7bew.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/marepajuwuf.pdfIn PDF document text
    • http://autoport76.online/reporting_requirements_for_medicare_and_medicaidp7agi.pdfIn PDF document text
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/31a3a.pdfIn PDF document text
    • http://biolinkus.me/wipetixisanisunegodkyvyv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_a37df2ebceaf47049e17210a0138e124.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_488432d759ba4256897336e5d8f520b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4790f5-9339-49c6-aa58-780619f3aef6/burger_king_january_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d81b309-d1a0-4461-8940-9faed65cd73f/naxaxavipojibodumamanafof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bacaa4a-0c5a-4321-b640-f27e2b3cd6a5/xemusixof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35304b0-1df7-47b5-bb1d-b1d7224bf9a2/basic_electronics_engineering_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73a5b2b-7bc0-4876-a45d-b75a7c202b2e/international_journal_of_research_in_medical_sciences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01d9bca-b436-415b-815c-adbee2fc003c/panasonic_omnimovie_vhs_hq_battery.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_603ff39589f54d078068ffc3c74ac857.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b615534b-e40d-4340-b6dd-2343e040a722/poxugoviw.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_ef2154cddc9b4d49811c9134b83874e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3448db92-2e2f-4f2d-95b9-25f102fb8046/56269793158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163aa2d9-353d-43d2-8647-00950ae5df46/ridapakaveti.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_44bb6d63abf64fee9ad7b5c0790acc00.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 3744 bytes
SHA-256: a515aa50afbffc8c50b20cba9730225ae779b5ecdb930240eb6a7af469f141b4
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 5160 bytes
SHA-256: ce174abfdc4d85bbd0a363a25003db9b3d2c9a1580ceb4d167790a01d6f17f13
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 11376 bytes
SHA-256: ed5126e0e17bf079e0bc6f69fe8ab557a87557d703b5b2c82153c13b6102546a

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