Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1114d8165fcb3a5…

MALICIOUS

PDF

79.6 KB Created: 2021-04-04 12:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a833b132b9923c761a3bda55742d5107 SHA-1: 10e4e450ec5ad662f44de6383cb6e022a3dda808 SHA-256: a1114d8165fcb3a5e10eae228dacec230fe683cef181ae2cbf8aa6518f384aea
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The primary URL, 'https://mezovuduw.ru/award?keyword=sales+assistant+job+description+pdf', is presented as a job description, a common lure for malicious documents. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=sales+assistant+job+description+pdf PDF link annotation
    • http://delayikapy.xyz/ios_13_developer_beta_4io25u.pdfIn PDF document text
    • http://center-san.ru/fexaresoniboted1b2w8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_5fdbbc4cc3634.pdfIn PDF document text
    • http://zexorusawuwurew.sportsontheweb.net/ed_ing_adjectives_exercises_with_answers.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/meladesozegolovaviw.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/6368478.pdfIn PDF document text
    • http://testersairf.xyz/lg_k20_plus_user_guide4snml.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/zutisenako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fe1d8545b364.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/7820f.pdfIn PDF document text
    • http://zahlungsservice-ch.site/what_is_the_most_powerful_force_in_the_worldza3az.pdfIn PDF document text
    • http://tomogorman.com/mach3_addons_freequade.pdfIn PDF document text
    • https://kebonipima.weebly.com/uploads/1/3/0/7/130740513/2108624.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/dapebodokonawagikigunu.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://uploads.strikinglycdn.com/files/c532b1e8-4478-4fc9-b12e-4426e80c57b4/74746568132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c681332d-85a3-4a2d-b682-b90a923da916/zopavusadagewoluze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44d8d0f-62cd-4dd2-9e97-83cf1aa06f7d/casio_classic_w-800hm-3avef.pdfIn PDF document text
    • http://jomupaz.myartsonline.com/tubefizumevudoxibenod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74968ef6-6fc6-4b62-b121-ef6bf35181e1/ejemplos_ecuaciones_de_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d168e92-d834-4591-ae64-606a7f1e0e9e/hp_laserjet_p2015_printer_warning_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f67956a-0a0b-400a-865e-60608a160c90/debosipipupurojezikigami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfccb42-786e-404d-84c2-e73239550180/captain_underpants_books_ar_level.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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5256 bytes
SHA-256: 6008321b5a5e6052a3f6d382ee02be5ce34509b345f150a696d5a1af214ecb7a
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10608 bytes
SHA-256: 372950ca7b1c6a1cc1583cd33d91c3350a2953d8d8960a7a09766fd632971171
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f