Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f31d0b151eb51e…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 23:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 58cfd3977d5f96847ab98f07b2ddf0d9 SHA-1: b15d4f79f39fa10e985d30e87e59c5c11405300d SHA-256: d4f31d0b151eb51e7251ef20012f583e0f32919fade5af0020116022a017aac4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a high concentration on disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL points to a domain associated with a caricature maker tool, suggesting a lure to a phishing or malware download site. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a malicious intent.

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://midufefew.ru/123?utm_term=clip2comic+caricature+maker+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406454/normal_6039595adbc16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412999/normal_5ffe8b29590db.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/strength_of_materials_singer.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/acm_icpc_problems_solutions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_5ff26474b9564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5fcf412364ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_601dd4b1d42f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_605127137f6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_60233a8eed172.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/faweregujubitoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412592/normal_5fe3c7d05bd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6057b3a6d436d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604a44d21ac33.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/fascismo_definicion.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/5d30ff28-6ed7-4d8d-892b-2ba1ca3609cd/how_to_set_a_howard_miller_clock_model_625-236.pdfIn PDF document text
    • http://fefiraxubuviwep.epizy.com/bsc_1st_year_chemistry_notes_2019.pdfIn PDF document text
    • http://runoxujozu.rf.gd/janapada_dj_songs_video.pdfIn PDF document text
    • http://lopovimefadepom.epizy.com/bitdefender_total_security_crack.pdfIn PDF document text
    • http://jodolevuvik.epizy.com/loxonunukabutubadetitam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7663d70a-6352-476a-b5e9-8f6f70631268/google_maps_timeline_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2143904a-9af7-40bf-bf9c-de08aef21476/tumurodejebizefome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c11a8a-a9bf-476c-8116-e57bce5df2e4/tizurela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9552b7d-8735-4881-ab9a-5413d8e05802/human_resource_management_definition_by_edwin_flippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542b238f-b29f-4f42-82da-7f6b53b9b6b3/easy_vegetarian_recipes_for_beginners_indian.pdfIn PDF document text
    • http://noratev.myartsonline.com/pdf_del_examen_ser_bachiller_2020.pdfIn PDF document text
    • http://xuxusemo.epizy.com/bmp_to_free_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08ead8c-59bd-4e92-a9cf-7c9ac0112552/dajexibesefedelor.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5144 bytes
SHA-256: 7ab9d85248fbc7c37aeddcd4f09d5ab68729a0f97e0b2970f62d29094f67d665
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 5248 bytes
SHA-256: b0f63e245d3b15072b6b51a924b3f5616c746ad82eefbe4a1955c44ebe69cb0a
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 11412 bytes
SHA-256: 65a68a30a9c264c315f59ae1f37ed324938da457af57220a0f4bccac24691503

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