Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efae5ea21a577ee…

MALICIOUS

PDF

79.2 KB Created: 2021-03-26 05:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6868d98403ca051243ead880c72b2b6d SHA-1: 3a3310c9c36f613483d30b3ee471eb8794fc6f02 SHA-256: 1efae5ea21a577ee072f670e8e3b5122238b2eaf9c1b5a1f5de110b22c9a8f6b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=digital+electronics+notes+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/bomumuxa/j7kjhk8/renidukigapozul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_602c99387cc73.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/6hIegdi/nufazif.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/giiDogd/26324610389.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/50352699912.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/zoology_objective_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fda2ad0e5aa8.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/jKFdRig/nukakujukijudepesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_6028e5883ef13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baletax.onlinewebshop.net/fabirerizefodotekefuvog.pdfIn PDF document text
    • http://sukijikulo.epizy.com/82853028850.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/jufemipixa.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_e339be2a660349d190a14751e4b9ed55.pdf?index=trueIn PDF document text
    • http://tuzixuruwu.rf.gd/buffer_solution_problems.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_3d12f716b4024a788e5bd465bbd155e6.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_5987f527e3ea4ad98961dad7111d0bb1.pdf?index=trueIn PDF document text
    • http://tepaduvofevog.rf.gd/98635608547.pdfIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_6fe67c61a9f74c83bc03f0ecb2692191.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 5416 bytes
SHA-256: e8b4008b9aa488a1fb725279881d2c594f556ace7019f0e74e83e01e3a331fcd
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 10980 bytes
SHA-256: 4746d8432d042d911da6c09d1b45f3de6066bf4f90eaff042f5ad023f140fe67

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