Malicious PDF — malware analysis report

Static analysis result for SHA-256 be629ca1afd8f080…

MALICIOUS

PDF

80.1 KB Created: 2021-06-04 01:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fbdb4318746ef99ced11110d85ecde81 SHA-1: 44ac1dd8a3b6e1774522ebc213e7aedc5c8a708f SHA-256: be629ca1afd8f080261b13f2a26349fa40b81ff5e26764ad4c1a9e65b06c3f15
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO poisoning attempt. One of the primary URLs, 'https://wastran.ru/pbw?utm_term=how+do+i+hide+and+unhide+apps', suggests a lure related to app management, potentially to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://wastran.ru/pbw?utm_term=how+do+i+hide+and+unhide+apps PDF link annotation
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/puwagigosugibot_denevar.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/jazevalojulem_pagazawom.pdfIn PDF document text
    • https://xupujudokoze.weebly.com/uploads/1/3/7/5/137509402/xareravelilife_kovototu.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/gulerusuradupefotodi.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/6ca422a.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/3415632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebapelamive.pbworks.com/f/86633978043.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/gta_vice_city_cheat_codes_free_download_now_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b020c4-65be-4816-9243-6f697938a443/gifakipatovunuj.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/how_to_write_a_conclusion_in_a_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a2e1be-bed1-4a72-8889-f6dfb64265c5/bumutijotifunepo.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/m3_data_recovery_full_crack_kuyhaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4d0ba6-6d0b-4768-ba02-ca2d605d588a/fexopazaxubug.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/pofewozubarixitajaw.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144576444/funciones_trigonometricas_en_el_plano_cartesiano_definicion.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/67664188306.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/fbise_new_date_sheet_2020_9th_class.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144579165/notodufenugop.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_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 4972 bytes
SHA-256: 27212f1fd3021df0012ea4c756109d80aecc76d9a292028b111aef894d4d2e8a
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10936 bytes
SHA-256: 8f009a53087dfca5e61b64f43532ab695b54fb46bba05a5d601c8e211f440dbf

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