Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d24f590aeddbb8…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 21:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5357447aa10951a6c7038ce4674b66e SHA-1: ec496a55b20217dd189586f77e3dd4cafc3b134a SHA-256: e7d24f590aeddbb82f4aed7e94fea648f965f0f0bc632245f7fd87c5149b7cd7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'nipisod.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of multiple unknown and potentially malicious URLs, combined with the link farm heuristic, strongly suggests an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=buku+andrea+hirata+pdf
    • http://tameenegypt.com/reacciones_para_balancearh129l.pdf
    • http://warupipujamoru.sportsontheweb.net/an_apology_for_poetry_criticism.pdf
    • http://meine-gebuhrenfrei.com/dorujuliponi4q0s.pdf
    • http://timurberg.ru/toro_lx425_service_manualb2cji.pdf
    • http://copyrightreports.com/5862139488jq8v1.pdf
    • http://galufixagomedo.getenjoyment.net/box_tops_for_education_products.pdf
    • http://zuduwamani.mypressonline.com/thyroid_gland_diseases.pdf
    • http://robugipunebib.mygamesonline.org/best_free_reader_app_ios.pdf
    • http://doordash.link/rifijixufovuvumazywjr.pdf
    • http://francobusiness.com/swann_dvr4-4575_manual4kgpx.pdf
    • http://esparks.ru/xiperomuxi0d5kl.pdf
    • http://tovelksa.website/2257586742wwivk.pdf
    • http://hhizmet.com/how_many_companies_are_listed_in_us_stock_marketsh4n3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_b895c2b5adec4780b0f768a6a36bf954.pdf?index=true
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_5e6f53feeacf428aab204571c99a11a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/593f5def-cfbb-4ba8-b737-0b74d6c813bb/ariston_washing_machine_good_guys.pdf
    • https://s3.amazonaws.com/rufonali/champion_wheelybird_electronic_trap_thrower_40909.pdf
    • https://uploads.strikinglycdn.com/files/8288c116-9351-46da-87ec-b58f48536f42/toner_per_hp_laserjet_1320n.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_7516d71fedd145b59837ae6966983921.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e881843-cde1-4c47-bc79-04e9cfce6670/simarevimasewijatamigoro.pdf
    • https://s3.amazonaws.com/sinamozagemoger/sodixoba.pdf
    • http://zonafikepejese.onlinewebshop.net/does_salt_draw_out_infection_in_tooth.pdf
    • https://uploads.strikinglycdn.com/files/6016e6be-ba53-4d15-92e2-553e63210a94/fulebobofidexijul.pdf
    • https://uploads.strikinglycdn.com/files/f98c0ca1-3702-4113-9067-9d074f9a4f01/14911396638.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f106.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 6440 bytes
font_01_sfnt_off000100fa.bin
94949907602c99bdec30878c16214406db07f11532af905245f904f1d4d3a7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 5032 bytes
font_02_sfnt_off0001121d.bin
2285fcbbbe39a97bfe8129015e4c9007e5ebf8b67b4348b1f61794314ae37c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 11012 bytes

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