Malicious PDF — malware analysis report

Static analysis result for SHA-256 2252c11a505f95c1…

MALICIOUS

PDF

79.7 KB Created: 2021-03-15 06:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e3170f0f615ee77a1b3a9de86be5fa34 SHA-1: ef72fcaf9f5c1edb1bcd7eb923e5f200606d6490 SHA-256: 2252c11a505f95c1aa051f1002c1e6f20ae1335d9c9cf44635be56a690b15bb5
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm hosted on disposable domains. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=capricorn+28+degrees PDF link annotation
    • http://bidizujimon.getenjoyment.net/tabidepodigovo.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/gjhdiak/safewabowojavo.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/tusek.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/material_safety_data_sheet_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_6037f43e139f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_6026127d81ff6.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/6927370.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/fjahdhb/tupajimi.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/alchimiste_livre.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/the_painted_bird_film_buy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_6024832fdd3f6.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/ec8ifc1/airtel_recharge_online_postpaid_landline_bill_payment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff9174ad0118.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/kimezibetatifilurodogapuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/cZrijim/world_building_craft_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/Tgiegxn/parsec_unit_means.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/21b156.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/relijuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/boletin_informativo_elecciones_2019_registraduria_nacional.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_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 5440 bytes
SHA-256: 1d0fa5453fe545843115a9e223de09f0189878eb1c5f2ffbac7f2ea1070db61a
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 10160 bytes
SHA-256: 19c959f4c3db8965fbcd07fedd6175fab49f4be1212803534bac1a825d560c47

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