Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42fcad0a6fdf1a2…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 18:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0603781922aca877cb8c0dea7e5cc9 SHA-1: d51b81475cba06b1cbc8e7e827abfebf9cbb823a SHA-256: a42fcad0a6fdf1a254e4a0ab694da28968d645148ee858107fcf9b26752482a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The embedded URL 'https://nipisod.ru/strik?utm_term=washington+dc+weather+10+days' and the document body's mention of 'Washington dc weather 10 days' indicate a lure to a potentially malicious site. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=washington+dc+weather+10+days
    • https://cdn-cms.f-static.net/uploads/4418574/normal_601de55417a26.pdf
    • http://madawuboso.sportsontheweb.net/28468515901.pdf
    • http://xitabijasava.getenjoyment.net/cuantos_ladrillos_entran_en_un_metro_cuadrado_de_pared.pdf
    • https://cdn-cms.f-static.net/uploads/4377377/normal_6054fb2eea120.pdf
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd641cfaa0b2.pdf
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6020d3a6ae9c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lunojol/7481108393.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_4e377262ff64433cab5598c914721740.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_4d24d05d19aa497f82128424337c4516.pdf?index=true
    • https://s3.amazonaws.com/kawotexulozax/how_old_is_max_lucado.pdf
    • https://s3.amazonaws.com/zuguvoxoki/autorun._exe_sysinternals.pdf
    • http://gukutimaguvuzum.onlinewebshop.net/sustainable_built_environment.pdf
    • https://s3.amazonaws.com/mijumomub/lopidesopulimalofana.pdf
    • https://s3.amazonaws.com/bomupi/a_touch_of_class_hair_salon.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_f9693dd807bc444397f9f805f239f3c6.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/fumobevixuru.pdf
    • http://filosoko.onlinewebshop.net/jeppesen_instrument_commercial_manual_free_download.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_3614d3edf5bc4d14a8df0cf0dcbc5e63.pdf?index=true
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_e3aabfef85e94f4abe3038db719d656b.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_off0000ecb8.bin
8d60b0a706d4a57e4cda1f024fa84c611a540f71142d4b51ae741f688d53ea0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5568 bytes
font_01_sfnt_off0000ffc5.bin
06054e14fed00eab095eedfe2ee3d1253dc696fd0a3e3a225bd456c497cf727a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 11688 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.