Malicious PDF — malware analysis report

Static analysis result for SHA-256 52efc5e632c1541c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-20 22:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 057f0b788c6ca1b6fd979bbb1e325a46 SHA-1: b0220c02b2f06f6b81e1db3d43f323eff0791bfa SHA-256: 52efc5e632c1541c59ce3806b1ac530115ae55cc2ddbfa7ea548ead9ab667f25
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The primary external URI, https://mezovuduw.ru/award?keyword=biology+questions+and+answers+pdf+in+tamil, is likely a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/award?keyword=biology+questions+and+answers+pdf+in+tamil PDF link annotation
    • https://cdn.sqhk.co/fowoleleda/hfjdCOX/94976352194.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/asterix_in_bengali_free_download.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/9245856.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/d7ad764470c1.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/sovexodevuvavujobume.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/igiUbji/bavipam.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/ddXjaij/nanuzife.pdfIn PDF document text
    • http://jakufodunod.getenjoyment.net/detoregasumit.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/mjbmBjd/beruxirorivitilireviriti.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://uploads.strikinglycdn.com/files/d53ccaf8-13bf-4fa6-a658-946af4ea548a/band_song_dj_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cddd541-357c-47aa-a44f-731d8575fa90/how_to_do_fractions_on_a_ti-84_plus_silver_edition_calculator.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/cantigas_trovadorescas.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_4716c96b2c8d445395da786f267b9740.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f679e644-9615-4cab-8b98-71517b9d98b2/gimazozevomagoputex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2512bbbc-b735-4135-9486-324d3279fc4b/fundamentals_of_differential_equations_solutions_manual.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_95b0f762985b44eb9331d67277700cb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeacbc55-c609-4908-b3ec-0f42345db937/75074902394.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_f2cd8a2d6c2845ff88a101d12fca1a0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b683127-2d8b-4374-82d6-8bf3950fa886/is_united_colors_of_benetton_a_luxury_brand.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_45d75b302c6b40c298bfe31cbeeae428.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_63bbd910e3c94de4815b3819d78501b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a43926-6d6a-4a0c-93b9-31e375eaccce/fojezes.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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5612 bytes
SHA-256: 1253bd50ecdd9b81dbd95c20a52e7d2562a18978224da142890b940cb36b53a7
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10784 bytes
SHA-256: b115f231c2e22c1b773f9e929384ef9f053a1922a3d8499c68306db26300a7e5
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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