Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda700d65590128…

MALICIOUS

PDF

64.0 KB Created: 2021-04-06 09:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 701bd0e9ede09b7214143b15f17ad646 SHA-1: 42ca79fb41f895975a16961b83ab71a5f55ed154 SHA-256: bbda700d65590128835f5305ecef96f4d507d598fd78ed48c2c3247646be304a
124 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm, with the primary URL being `https://baarspo.ru/123?utm_term=funny+child+video+song`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and mentions 'Funny child video song', indicating a lure. The presence of numerous links on disposable hosting and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 4

  • 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
  • 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://baarspo.ru/123?utm_term=funny+child+video+song
    • https://cdn.sqhk.co/wusezofetib/9jfpgfZ/wifaludamazajobezamazo.pdf
    • https://cdn.sqhk.co/xevowuto/hiieihd/world_rowing_u23_championships_sarasota.pdf
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/9539631.pdf
    • https://cdn.sqhk.co/zojixemem/jhfTTha/34222561005.pdf
    • https://kexekogu.weebly.com/uploads/1/3/1/3/131384418/bezusarifademuwubi.pdf
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/fower_wonew.pdf
    • http://resitegun.22web.org/nazawiwovijaxox.pdf
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/pazaxusiw_mamomita_gesebenago.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/ea7e896db3.pdf
    • https://durewipi.weebly.com/uploads/1/3/5/3/135301904/1004200.pdf
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/2f2ec9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_33b81027d35147c088f112460220cf4b.pdf?index=true
    • http://wudotope.rf.gd/tukipujixujori.pdf
    • http://rewexukid.epizy.com/autocad_2020_serial_number_and_product_key.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_d66f53e429234d4bade4a21a55d60bc1.pdf?index=true
    • http://wopufuna.rf.gd/attenuation_in_networking.pdf
    • http://lemizirimafon.epizy.com/advantages_and_disadvantages_of_mobile_phones_in_points.pdf
    • http://vofovesotidogi.epizy.com/sibafolerifenukurasosig.pdf
    • http://dusijilesa.rf.gd/chava_kadambari_file_download.pdf
    • http://kisitibonadal.rf.gd/thinkorswim_web_based_paper_money_login.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effa.bin
c56d4e9cde6b665b83f3d711674ad2cf338bc7b1cc2bc8e271846b561d7a96d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 5012 bytes