Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ff0737ba483a46…

MALICIOUS

PDF

84.2 KB Created: 2021-04-28 18:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7f5535b7c3dc263a9721efca53946cb7 SHA-1: 40372a0099038d9ac7fc7aef443ce0b413ea577e SHA-256: c5ff0737ba483a46c8f7649b1d4204d8f293949e9aefd1c93d278078db2f0503
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=are+kaz+and+inej+in+shadow+and+bone PDF link annotation
    • https://cdn.sqhk.co/tojegaxamox/heergj9/rusawod.pdfIn PDF document text
    • https://nifebupamej.weebly.com/uploads/1/3/1/6/131607321/410ab4996.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/ifgcZgj/8344812925.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/tobukufag.pdfIn PDF document text
    • https://tuluseso.weebly.com/uploads/1/3/4/7/134718642/942b38.pdfIn PDF document text
    • http://tameeniraq.com/rewuvepaxojibotis71psq.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/5972281.pdfIn PDF document text
    • http://braco.ru/46667290648mg1mm.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/lnYjVfI/aai_milan_ki_raat_all_song.pdfIn PDF document text
    • http://alexandreablog.com/79944363905nw5yi.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/5cc98878.pdfIn PDF document text
    • http://xuvavarapegu.mywebcommunity.org/listado_de_alimentos_con_gluten.pdfIn PDF document text
    • http://usacreditcheck.info/magawig14vfj.pdfIn PDF document text
    • http://mpvideo.org/adult_coloring_book_ocean_animal_patternsdb0n4.pdfIn PDF document text
    • https://mapuxotegudu.weebly.com/uploads/1/3/4/3/134356271/3577439.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jbY4Bxe/kawaii_anime_girl_hairstyles.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/11089258626.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/xaforejuriv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/90501402291.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/what_were_the_financial_effects_of_the_september_11_attacks_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6258fcc3-7a95-489c-b789-6063149e3211/62926982596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423fefb3-176c-4df2-a330-dceba7481392/40529803777.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/what_percentage_of_diabetics_are_type_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c63b8f-95e8-421d-8f1a-b889410c7e1a/american_journey_salmon_dog_food_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f53b46b-179a-410b-ba3e-3cf7e789fbeb/koxedalopigum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765bf7d9-51a1-4617-910c-fe98bbaa1556/xuxuvenug.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/developer_android_studio_index.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/xezuzuwutebibokol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 5000 bytes
SHA-256: 30779e2840d19ad642a6e4e38488f715524ff2889c5d513cae0b28bb21b72386
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 11276 bytes
SHA-256: 93034a929d321bc715884ab096072c8ed9e2db0a1e8c073ed0a26fa69f6aef77
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2