Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafc683cf67c1cf6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 20:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da506d2c312c56d15fe3807e8afccd2c SHA-1: 74219189bcfc08a6e04cc1ceba9546c383472c6d SHA-256: fafc683cf67c1cf62a62b32f4b65525dd160ad59dfbe0ceab80febd58db322b1
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a link farm, with one prominent URL disguised as a search result for 'starcraft 2 how to play free for all'. This URL, 'https://xezojetit.ru/aws?utm_term=starcraft+2+how+to+play+free+for+all', is likely malicious and serves as the primary lure. The file also contains numerous other links to S3 buckets, some of which are flagged as benign, suggesting a tactic to blend malicious links with legitimate-looking ones. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/aws?utm_term=starcraft+2+how+to+play+free+for+all
    • http://thailandlove.site/70201949933xmatn.pdf
    • http://nerroba.info/arris_dg860a_firmware_updateg2yfs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinisemowoge/moses_prince_of_egypt_movie_worksheet.pdf
    • https://s3.amazonaws.com/bepukuba/hong_kong_fatca_reporting_deadline_2018.pdf
    • https://s3.amazonaws.com/vipuxafol/1221479692.pdf
    • https://s3.amazonaws.com/jexijer/android_mvvm_github.pdf
    • https://s3.amazonaws.com/zunewidimem/casio_baby_g_shock_5338_manual.pdf
    • https://uploads.strikinglycdn.com/files/57275dca-189d-4870-b35d-5ff1c9e9970d/how_much_to_send_a_30_lb_package_usps.pdf
    • https://s3.amazonaws.com/zevutebulaworel/basket_puma_x_ader_error_platform_trace.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_857baa8dc3f44703b06cfe240d9e3242.pdf?index=true
    • https://uploads.strikinglycdn.com/files/929b1843-958f-4925-91cb-71caf5b1c39c/8_basic_knots_bsp.pdf
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_15ca4dae342749969902b309bc26d58e.pdf?index=true
    • https://s3.amazonaws.com/tobaziw/26170559777.pdf
    • https://s3.amazonaws.com/pululusodogi/configure_fios_router_for_vpn.pdf
    • https://uploads.strikinglycdn.com/files/c28b4847-eee6-47b2-ad34-3d6a52185841/vekuvubopelerozuzuriperig.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_06e289e305114998bd40114e554bcb84.pdf?index=true
    • https://s3.amazonaws.com/feborobegibew/nodikofi.pdf
    • https://s3.amazonaws.com/zukogi/handy_stitch_sewing_machine_not_working.pdf
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_e8097d20181f45fc86ce6bedd5fb5928.pdf?index=true
    • https://s3.amazonaws.com/selivuvumepaveb/71614781562.pdf
    • https://s3.amazonaws.com/fixararololu/tamil_hollywood_movie_trailer_2019.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_off0000e7b1.bin
0ba3b39103413b56656d7d2cbd717ebaa8113e284c542cc278b611dd6577ebbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 5356 bytes
font_01_sfnt_off0000fa01.bin
d08338b939959c088d67ffe5d32937b1b9bff531adb968f60f4b9e05c9b33011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 10296 bytes

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