Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99c0797710ed322…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 07:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 470aff04c8baa1c2afeb5871ac864147 SHA-1: 9c34530bf77ccc94b8c7e27de1d941c7693c8d09 SHA-256: b99c0797710ed322d408a70efefa553ed7d43e2fb81082118ce362d34b3cda3f
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, jottigo.ru, which is likely part of a phishing or scam campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM also indicates the PDF is designed to drive traffic to external sites. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or content redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/award?keyword=first+law+of+thermodynamics+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6026b2c528204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_604d2bc954f21.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/how_to_record_accrued_interest_on_income_statement.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_5fedd90dd824e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_6028c48c70978.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/iUZcift/33915235623.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/gljjjdS/master_craftsman_definition.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/algebra_de_baldor_ejercicio_98_pag_161.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/tikobaguvaj.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/69101341935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_600c72d2f16db.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/hcjhhbo/tezigerikegalogexefalis.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/a3Ugd78/21823647552.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/buruxatujetetolawudinusov.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/89205422449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe62d02-4bb7-4b5d-b0e5-88157626e698/how_to_use_ninja_juicer.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/trigonometric_formulas_class_11th.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/fallout_4_quest_mods_for_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/68409884241.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/20092222152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80c232c-42d5-488e-b504-768129ad12de/13836477743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca12bb45-0440-45a0-8dc1-d2f1e0bf5134/54606815267.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/period_stain_hotel_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0e2a31-f593-4c58-9b87-0fff2e19ee4b/8063236603.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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5668 bytes
SHA-256: 7be067e4bb39abd23181d7912f4febf2e662ed8b069438a27f58cabf820324d0
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10996 bytes
SHA-256: b56d358c097910344806bbe9282bea85b6da47a1d439cbb0a4e61060729cec4d

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