Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c4dd7c2fec873…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 04:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6b3bec7b4b57c319c8da5ad3a76bf34a SHA-1: 82d6d1ab2a9bf51483c31d26ac118dc13afe13ed SHA-256: 2f4c4dd7c2fec873ac1eff62f8eff75175d79f94a5b56d78c58ca9a52566ec6e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to various PDF files. One of the primary external URIs, 'https://nipisod.ru/award?keyword=commercial+script+template+pdf', suggests a lure for users seeking templates, likely to redirect them to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

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 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.
  • 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://nipisod.ru/award?keyword=commercial+script+template+pdf PDF link annotation
    • http://3gusevshop.space/update_version_chrome12vm4.pdfIn PDF document text
    • https://gixopujo.weebly.com/uploads/1/3/0/7/130775076/3519858.pdfIn PDF document text
    • http://carbackseat.site/bmw_5_series_e34_service_manual0gt46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0fa4f1fbf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_601df78539aee.pdfIn PDF document text
    • http://naturfresh.fun/tamil_dubbed_animals_movie_freei5z3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_600a82333cc4f.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/biwodumunodose.pdfIn PDF document text
    • https://pemopuxurumolu.weebly.com/uploads/1/3/2/6/132681293/2bf35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/37355610522.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/66123614963.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/84229107297.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_d558bb70444f4da3bda0e745ecc492c7.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_df55dd73ee734883ad1985b42c908a11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/internal_auditory_meatus_mri_report.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/zijoma.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_c8b949c1f4484a8eaad167e90f0d065e.pdf?index=trueIn PDF document text
    • https://00741ec3-e410-48a0-841c-9d69f68d82f8.filesusr.com/ugd/7a11b0_73b1b9d30aec4fc4927317d106c4b075.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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5208 bytes
SHA-256: b667de63592676334ac040ee4c298b270f3f0802159b4f98f555c02dd484c936
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10112 bytes
SHA-256: dc64731d84754bbcbbd48fa26a21dc5d3941ff834672ab0d720efdba6b84a303

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