Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82ebb6868ca941d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-07 15:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aadfb428a41401e350e42f75c80ea815 SHA-1: f09505ffe908e3f281c73226f5f30022f1a65625 SHA-256: c82ebb6868ca941dde691ee2baf23ee35469f363c2b7d9e4cd7d5a703cb77a5c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed 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://gimoguvi.ru/strik?utm_term=how+to+make+a+water+play+table PDF link annotation
    • http://pufivuziviv.mypressonline.com/how_to_make_car_decals_with_printable_vinyl.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/f1ee0146.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/mazizet.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/surivamesidimom_fuzeki.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/zHZ7hbA/34582064258.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/djijapU/wopafapawewaxiniturixenik.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/iVjejgq/50468510041.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/b0nkjhU/basketball_world_cup_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9c2a3a-78ea-40ed-8cb5-78c2ec01b6a5/taxobukapisili.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/38467452960.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_d885a391072d44e7a1719ad8ffec8a1f.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_e0df09276f9b45ffba4537cdc068e476.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd494835-0d94-48e6-8fe8-cbd826538a58/rowobevevikez.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_faa0cfe4223c47cda886064c5f2fa99b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad97d13-5f27-43b1-9573-f2eebf7286b0/16596166679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa392d1-32c8-4cca-8592-3399ab05007f/fanuc_macro_programming_examples.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/tegogalije.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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 5144 bytes
SHA-256: 4c884c31e141c47cfedaa165d945d77bd545d3bd9a7801084801e1edb2a90a6b
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 10592 bytes
SHA-256: 36c283ab53603358fc12a301817e1ddfe0513a7a033f828e393ee68fd33e1b34

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