Malicious PDF — malware analysis report

Static analysis result for SHA-256 f664b1775c0c246b…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 18:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a31e13ffd110ac7f4f712e62a71cbb3 SHA-1: 2f0ad831361478322397402fe484dcd135a41415 SHA-256: f664b1775c0c246ba701001d426776d2b187c9c1fadabb7cc7ac75ac8dc8584d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/pbw?utm_term=how+to+perform+a+dexamethasone+suppression+test
    • https://pumewuku.weebly.com/uploads/1/3/4/6/134638235/780c47e97.pdf
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/paduxetajemi.pdf
    • https://cdn-cms.f-static.net/uploads/4465690/normal_60502eb5515a2.pdf
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/tawugixino.pdf
    • https://cdn-cms.f-static.net/uploads/4451025/normal_603665b1ab1ab.pdf
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6034265fef7f9.pdf
    • https://static.s123-cdn-static.com/uploads/4412773/normal_60060665e21cf.pdf
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/1796409.pdf
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/moduza-megovotuzu-zisawaxonuf-wewun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/983b7a19-3c88-4e16-b27b-1ef05bde9024/pisiwafi.pdf
    • https://uploads.strikinglycdn.com/files/b00b6c38-fbd0-4eb1-bfbd-e554bc14597b/jisoxojokaropelijodefoze.pdf
    • https://uploads.strikinglycdn.com/files/e9021adc-da33-4158-a575-c911cab31d63/fidedawef.pdf
    • https://uploads.strikinglycdn.com/files/dac7c681-ad3f-4c1b-827c-7ca0604fa226/metapixo.pdf
    • http://jozeluwofe.pbworks.com/f/perumivamofilukip.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144415719/descargar_gta_sa_para_android_lite.pdf
    • http://fokopaviwu.pbworks.com/w/file/fetch/144462705/matching_letters_worksheets_for_kindergarten.pdf
    • http://xedidovetaw.pbworks.com/w/file/fetch/144416592/which_fake_gps_is_best_for_pokemon_go.pdf
    • http://pevozowo.pbworks.com/f/nidur.pdf
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144422346/google_dialer_mod_apk.pdf
    • http://xutosop.pbworks.com/f/how_to_install_netflix_on_android_auto.pdf
    • https://uploads.strikinglycdn.com/files/75fede2b-a93e-481c-8582-47655d44e0f3/39371346943.pdf
    • https://uploads.strikinglycdn.com/files/0ee2f597-c023-45af-8697-f5e6138f3e7e/mametubusire.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144436281/new_balance_md500v4.pdf
    • https://uploads.strikinglycdn.com/files/5dd04fb8-a268-4cc5-a516-2ba4d2d48c34/biddeford_blankets_polyester_electric_heated_mattress_pad_with_analog_controller_king_white.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin
dd18eb1979d433dca1c6f30e1e5af7056c7ce0c716012c6bb2cf339530555cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5372 bytes
font_01_sfnt_off0000f806.bin
4c9c8aac4cb9ea7e9689d443926b7896e20bcf77a0d6862281d9388390474ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 9896 bytes

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