Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f5512192a4f5c…

MALICIOUS

PDF

83.7 KB Created: 2021-04-08 17:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d79b873aa0bef45dfb71192bc36346b3 SHA-1: ea885f0178124ffe54a3dc6143b06c0815ce958d SHA-256: 721f5512192a4f5c788a2677a3ceacd7af834f1443cae4e5c767b01271ce89ec
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous external URIs, with a primary suspicious URL pointing to 'gimoguvi.ru'. Although no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://gimoguvi.ru/strik?utm_term=honda+civic+maintenance+codes+b1 PDF link annotation
    • http://kafalukuwemi.mygamesonline.org/1990_jeep_cherokee_transmission_replacement_cost.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/gimumekepivotinugilenerag.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://s3.amazonaws.com/gozifep/what_is_thermal_efficiency_of_ic_engine.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/45914910856.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/25151142738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20491bf-3f2e-45c8-acc8-4eb215fb9a7c/how_to_learn_scales_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b219f25-7d75-4661-ad1d-22e141189e9f/zuvusabiwezisasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78294527-ceb0-4f91-975a-4cd0afe13ab2/34864042169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2055e2-c57f-4bd6-a6b8-1b9aa1efee98/how_many_companies_use_enterprise_architecture.pdfIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_d0abc291202f446d8e7ddcf25021c00b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/314ab0e9-383d-4a09-a409-61555ad0bae6/294355333.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/sigexozez.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_40ced800a63b493cb8ce6247ba98969c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bba8d35-d08f-446e-a11c-8307dcb16f23/craftsman_12_inch_band_saw_sander_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917abb1c-a6cc-4f6a-acca-9359a40754cc/biwofojosas.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_fd2d249baeda49d687d76382795023c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c77d542-ce86-40d3-a8ee-ee965a01baa3/football_manager_2016_names_keep_changing_fix.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e1d5aec0427b44b894a4b1c333b177a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/sony_alpha_dslr_a300_review.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/zopuridujifakujelerikidek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91de25b6-b589-4ad6-88f5-1b4c992aa780/64934649218.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_4c12532cd3b2489ca5ea2682de3ed9fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/gaxogamitojedemum.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_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 4960 bytes
SHA-256: 8dc3f6ecda8f7897504764e09208f9d166dfdcd261d3acf6d6f7d8c166f01563
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10560 bytes
SHA-256: cbd2184c4e6178f45c56b94bb9a1d720891f77ad816772fe84d8a9d2caf118c8
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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