Malicious PDF — malware analysis report

Static analysis result for SHA-256 26603415ba6144e5…

MALICIOUS

PDF

112.9 KB Created: 2021-03-12 08:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07670c0fe615f44f14015176f3d78106 SHA-1: 3374d4d41d160270a4419376a16b5834538f0578 SHA-256: 26603415ba6144e5436cefa44418ee756fd055d2131ca2b6ce03f1604ef5483b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with https://bologen.ru/wix?keyword=spatial+association+definition+psychology being a primary example. The document body is heavily obfuscated, but the presence of external links and the heuristic firings suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=spatial+association+definition+psychology PDF link annotation
    • http://kenugizi.getenjoyment.net/clark_gcx25_forklift_starter.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/vemazitegagibokunubojaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374688/normal_5ff98bf414e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_600eb4117eff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_60482bb12e855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6035d8938cd86.pdfIn PDF document text
    • http://zebiripu.mygamesonline.org/jimonebawalex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fc77231d63a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fc60f3cebedf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6039764e88a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6041802127b23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_a48ef0fa785b420484f88dfd3d7e7622.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_4a94a546c852445385f5ee3263182c28.pdf?index=trueIn PDF document text
    • http://judiserod.onlinewebshop.net/guerrilla_warfare_meaning_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3480125-4343-4239-ac25-3d752e683467/will_there_be_more_percy_jackson_books_after_heroes_of_olympus.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/cual_es_el_campo_de_accion_de_la_psicologia_social.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_bea1998a0201465da7bf423a872c2230.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_286985f2aad64d20b862d36d1223654e.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_92b088108bd044d2a2c87bda2568a111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/905d43cc-4202-498a-ba58-70cbe7e7133c/how_to_change_time_and_date_on_timex_ironman_watch.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/shirley_jackson_movie_trailer.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_off00017c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1F 5528 bytes
SHA-256: 410aceacbdcc732b86ea93d4cbc231496baf82e93afee3efe6982e903c4372be
font_01_sfnt_off00018eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EED 11444 bytes
SHA-256: a7c91b07d44db89e3e79ccc8a14218bc818dd2205cbd16000ab6afe451f5b02b

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