Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3966d984fc4ffa5…

MALICIOUS

PDF

71.3 KB Created: 2021-03-28 20:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6af7e84d4e27079c26331102d89818af SHA-1: 8752871d16ddc58e29f6d7b88ed8c87b46f83f94 SHA-256: f3966d984fc4ffa582a3e6931f449052ad87512c81e3829e59b62d5ceff0c8c4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to 'nipisod.ru'. The document's content, though heavily obfuscated, appears to be a lure related to 'Castrol edge professional a3 5w 40 pdf', likely intended to trick users into clicking malicious links. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests potential for further malicious actions upon link interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=castrol+edge+professional+a3+5w+40+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473044/normal_60591dda0a995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6033f9561a99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6035715b1198a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476782/normal_5fc757230f4bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500669/normal_5ffc099e42d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5fdbeb312736b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5ffce3f90d698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_06cb7c29aaf04431bff9ad83099cc135.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_479a120ca6104306bd5d3c452a0aa930.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/esc_guidelines_infective_endocarditis_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5189caac-b858-48b1-9517-132c241be3f2/58683641664.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_b84c63a9aabc4e28899cead7d1031efd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbc9b13-9b18-49c4-a3da-e9a5e0191445/hp_laserjet_p1006_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911db2aa-b530-484f-b726-47be77ce33c5/tevipafexepubofuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13c3ab8-5a56-4d2a-b477-addc741f4b53/wildgame_innovations_cloak_pro_16mp_game_camera_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/lazarillo_de_tormes_autor_teorias.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_19fe3d5eb4854f959154bf31063f669a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b86a4c-29f3-4a63-a7b5-102cffc4afd2/swisher_vs_dr_brush_mower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66a3072-9ce1-40fc-8e25-83e6fb2b4a62/pokemon_ultra_sun_and_moon_how_to_change_festival_plaza_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/28129770507.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/roxivawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9acd39b-ace3-4262-99ae-dd5c3289ff29/97515052604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d1b03c-d674-4497-ae13-ed383fc29908/dominos_do_vegan_pizza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2038976f-5868-40cf-9682-b474d9173d8d/bullet_rush_game_mod_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 5724 bytes
SHA-256: 6e0057990f134b810047965d8ab8476702def4d6e711e518e9abd9bef56645c4
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10152 bytes
SHA-256: 77dad27680a1dacf0e284c170de3e13c5a2a6cfe8f5cc28cf535c4855f60304f

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