Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b4dd95d7be024d…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 12:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b041c95358853d0f9509532a936d576e SHA-1: 71f3f995ad5e61ca125d1104c88172305f190a93 SHA-256: 73b4dd95d7be024d7cf6b37f2b3cd70fa0db7583854b460f190d8c960beeaa4f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/pbw?utm_term=how+do+i+write+a+cv+in+south+africa+2020 PDF link annotation
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/7841562.pdfIn PDF document text
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/jigijopuj.pdfIn PDF document text
    • https://gapixupat.weebly.com/uploads/1/3/1/6/131637313/8132882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5fdfb79170489.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/8357397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_60061dcf64d4d.pdfIn PDF document text
    • https://savapavazatu.weebly.com/uploads/1/3/4/6/134677348/dimulixa.pdfIn PDF document text
    • https://mijolepeworid.weebly.com/uploads/1/3/5/3/135394353/zinujejidep-vasowuworixe-busudojomodutun-bajipenemala.pdfIn PDF document text
    • https://ritidajadufe.weebly.com/uploads/1/3/4/6/134622671/gujiwofomuxer-pobimafijiw-lusujew-badawomapewali.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/jipitimoxiz-gutavosesem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_60521a6465dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_600d9f6ece9f2.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/cd2dc35e-d5a2-4e82-ace3-f19f65e19af9/16370400610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5cc0ee-269a-481a-a187-8af7f5c9670f/diccionario_de_filosofia_online_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fccb8b-96eb-497b-a436-a2cf7c7467ae/fidob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf659db-f32d-4277-baae-2150deb4d0b3/battletech_game_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e54b14-d96b-4110-8d6d-a5ab4a1371f1/70618060670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b530689-da17-405b-9164-906678427c7b/how_to_set_up_my_cricut_explore_air_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13726d01-1235-4e60-9d3f-5a0b61dfb1b7/gadofowojuwepejevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9541647-229e-4325-a0f8-6b9b3eaa2c55/assassins_creed_syndicate_trke_yama_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e31b5c-7064-487c-9c2f-494525aeb851/how_to_translate_to_chinese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f093cd55-527c-4d61-a999-c8c6aef7f4c2/how_do_i_program_my_emerson_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb37b597-71c8-464b-994f-9d8c25e096aa/watosobemaxewisikasadan.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5464 bytes
SHA-256: a626c24168e978411274cdaf919f57f4861b43113caa636296f872ab36a2aedb
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10412 bytes
SHA-256: 10851265a7141e3b0801a49dbea1c15a784f9df5d7188e03ee212ef66465c0c6