Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd03cb3744431bd…

MALICIOUS

PDF

131.2 KB Created: 2021-03-15 19:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ffcec1368fffbf216c54ccb7d2d34218 SHA-1: 98c21a345a065152b849e2c46d46a098d02fc8f4 SHA-256: 5bd03cb3744431bd02c9e6e2202eb2a048706642f8bc0adb32b8f2cf52828dbe
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 0.9995

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://jumiwimov.ru/123?utm_term=andrew+scheer+platform+housing PDF link annotation
    • https://bedujutetedaj.weebly.com/uploads/1/3/0/8/130874043/8175474.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/tidorusuv.pdfIn PDF document text
    • http://feyakast.online/fixosegibitojewopiniladmbuv7.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/rivujisude.pdfIn PDF document text
    • http://filemarker.store/the_bluest_eye_quotes_about_chollyd0i3g.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/33e4f4893cb746a.pdfIn PDF document text
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/zaladenozuk.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/5059692.pdfIn PDF document text
    • http://eu-study.ru/how_are_folk_and_pop_culture_similarenpri.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/xemupuvusiso.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/97449011654.pdfIn PDF document text
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/3938374.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/9481319.pdfIn PDF document text
    • http://picply.ru/75280921649pjbkj.pdfIn PDF document text
    • http://mail-autoscout24.net/dungeoning_idle_dungeon_crawler_modtd7e5.pdfIn PDF document text
    • http://vududodudo.22web.org/free_template_for_annotated_bibliography_apa_format.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/5dd74.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/xevukametifutex_wokilefodeliwe.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
    • http://wesaxerofirivo.epizy.com/mr_coffee_coffee_grinder_wont_work.pdfIn PDF document text
    • http://simagofuzod.epizy.com/fatepisuduwikin.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/a4_graph_paper_template_word.pdfIn PDF document text
    • http://bepinutarefe.rf.gd/54830012626.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_off0001b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4CD 5532 bytes
SHA-256: 148fb10a95d1335de0f80c6888852a5504a72e74a756c81488d1f8e9edac81d0
font_01_sfnt_off0001c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C779 12412 bytes
SHA-256: 979927d59fc49a861521e46e45ebfd272086e7eb5c06f9a49e55188ebc2da579
font_02_sfnt_off0001f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0DC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f