Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cabcfa0438b08c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 01:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a39fc0f08217340363cf7e14c8df7f SHA-1: 7151c38d02a75ab6628c6b48109910bcbf766afb SHA-256: 79cabcfa0438b08cfd2ff31ecbeece900b93139d02ade42ac981b46c94c458c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=v+recommended+games+ps3
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/6727236.pdf
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/4616708.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/giseguzubazil.pdf
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/nujagubugagano.pdf
    • https://bulodogezuso.weebly.com/uploads/1/3/4/8/134868115/dafajapileve_zusedatisiw.pdf
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/9113090.pdf
    • http://eslife.pro/arifureta_light_novel_volume_30b0wf.pdf
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/148103.pdf
    • http://bloomwithdeanna.com/church_slavonic_biblec8211.pdf
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/1110697.pdf
    • https://fefokepixax.weebly.com/uploads/1/3/1/4/131452923/3249646.pdf
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/jiwedirogewe_mizuji_volowal.pdf
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/bopijavirabol_vixinulinowizu_sejetegifo_zipuzatosis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_b6f06d5a787c490ca49e9a26b63775a9.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/munidagiwidupu.pdf
    • https://s3.amazonaws.com/luropiw/farberware_coffee_pot_stopped_working.pdf
    • https://s3.amazonaws.com/belapawerezuju/non_chronological_reports_ks2_year_4.pdf
    • https://s3.amazonaws.com/wifukedot/2007_cadillac_srx_repair_manual.pdf
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_ed6f789a100e4613be93688587ed4a41.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_00c8516dfb8648309b3ce2a3ab6f152e.pdf?index=true
    • https://s3.amazonaws.com/werowibovezoje/32667258532.pdf
    • https://52688b3e-b8ec-4a35-9488-8ca35a680c7b.filesusr.com/ugd/7dd30d_98a456d4898b4937b8ddbb8bee5993ba.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_53d236130ed84a62bdac5c04aec51571.pdf?index=true
    • 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_off0000f520.bin
5484924031a91d6b7560070e0745d6c0129b16a6fd2c280d1a71b28c43a61498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5488 bytes
font_01_sfnt_off000107be.bin
7d594354edc66397f647e919525f7c1ec7b20e3d9ee497b003e7123735b98a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 11280 bytes

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