Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa3df6a1061a960…

MALICIOUS

PDF

71.1 KB Created: 2021-03-19 04:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 15285b660861941d67c83300e6682141 SHA-1: 86b1bdbc2ede374944925ee35f6db38d632a0719 SHA-256: 9fa3df6a1061a9606480924ee69b9dfa7b0eeb871b4ee8df08e2e7c31bcb713a
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary malicious URL, 'https://lozipotod.ru/strik?utm_term=the+origins+of+totalitarianism+ebook+free', suggests a lure related to an ebook, aiming to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=the+origins+of+totalitarianism+ebook+free PDF link annotation
    • https://cdn.sqhk.co/givesaxi/hfgehjq/samunurolidodixovadogu.pdfIn PDF document text
    • http://airet.space/zaxisepezitarinuruv92x3.pdfIn PDF document text
    • http://shishkin-seed.xyz/the_pursuit_of_happyness_chapter_6_summaryjqbeo.pdfIn PDF document text
    • http://trickyturkey.com/rivugoditedovepekoxoxembd4cb.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/mFZN6ib/18731399895.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/H2hegjO/xafobuvofusib.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/vBWhcxO/aesthetic_background_laptop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regovud.epizy.com/exercicios_de_ingles_imperative_form_8_ano.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_6da4d37a81614bb69a3263ed15fc4fa0.pdf?index=trueIn PDF document text
    • http://lufivut.rf.gd/press_release_in_business_definition.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_e0e7e4b8bab84d169235356a58bcf36c.pdf?index=trueIn PDF document text
    • http://misupegadux.epizy.com/vaketexajanone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42136a1c-1e67-4046-bc39-ecd486b11574/dagurawedik.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_5066d272068b41faa71b86db2d49dbc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b77ee55-8b36-4ac5-a564-715d07e53f79/tediwepomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da833ba7-31e9-4724-9a39-022768728bea/semitukojeki.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_f3d350dd8f234325b1dbd6a762b83293.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_9895da420d664c3a887da2aa826795bf.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_897afc625df147598ed6a292bdf05aae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebfb363-cb86-4f97-99cf-8772e376c6f3/harry_potter_and_the_sorcerers_stone_book_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73811169-0722-4891-a817-3482c2bc5a9c/zowubax.pdfIn PDF document text
    • http://sijaxulo.rf.gd/xabirekutizodatute.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 5336 bytes
SHA-256: 4cfd5b75000ea5d057988d5194c437491041e89ce3f28ecfaed27b49315a8a81
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 10576 bytes
SHA-256: bcb1b4acd2ebc3e200b7dcd1b1a57ee529365c479deb32dba89e53a4fbcc45b6