Malicious PDF — malware analysis report

Static analysis result for SHA-256 03534bc076918f4c…

MALICIOUS

PDF

80.8 KB Created: 2021-04-06 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10df6e1f5ea9d9e612e47b8e6d837d08 SHA-1: 5bca28ff0efa215f70068486ea8d3cc95ee49382 SHA-256: 03534bc076918f4c71583dd216edf7c93efbd2b20bcae79b352b3eb93203022b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with one example being an S3 bucket URL. The document body, though heavily obfuscated, contains text suggesting a lure related to 'bad eating habits'. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://ponafet.ru/award?keyword=malos+habitos+alimentarios+pdf
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcca6edde4f0.pdf
    • http://bulakirip.getenjoyment.net/how_does_vsepr_predict_the_shape_of_molecules.pdf
    • https://cdn-cms.f-static.net/uploads/4464700/normal_601d7a1596f38.pdf
    • https://static.s123-cdn-static.com/uploads/4452834/normal_6000a8147123e.pdf
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/keviwij.pdf
    • http://zefutuwukeras.getenjoyment.net/backstrap_weaving.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/sunirusibi-wibelovotak-zazutikisuga-sibexelela.pdf
    • https://cdn.sqhk.co/jaxubefe/gfEghjb/stickman_fight_shadow_warrior_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6041cb34cbd9f.pdf
    • https://larikizog.weebly.com/uploads/1/3/1/0/131071312/femitijon.pdf
    • https://cdn.sqhk.co/jomububorava/halkghF/crazy_dino_park_race_of_explorers_tips.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/falejogajir/80132952165.pdf
    • https://s3.amazonaws.com/bugutaj/fologatukira.pdf
    • https://s3.amazonaws.com/firigugixujotov/network_analysis_arcgis.pdf
    • https://s3.amazonaws.com/bitizopovopaso/82119033971.pdf
    • https://s3.amazonaws.com/rebomedug/pegorixovuvofakaf.pdf
    • https://s3.amazonaws.com/dukajevo/fesepopelipabaxalojofoxax.pdf
    • https://s3.amazonaws.com/sazixipame/world_of_warcraft_engineering_guide.pdf
    • http://juzapurul.onlinewebshop.net/lusujosaridawaxapixikitir.pdf
    • https://s3.amazonaws.com/bisapovepizaj/msrm_repeater_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef58.bin
05a9375de2d19b2d5392c7304b4d9012e207184b9b2e4cb49c89a8040453b5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5216 bytes
font_01_sfnt_off000100e0.bin
317af5b196ba99ff86be988ef4563ded366da514a7f80c3e62bfa88e61ea8a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 11568 bytes
font_02_sfnt_off00012678.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 4324 bytes

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