Malicious PDF — malware analysis report

Static analysis result for SHA-256 530d511caa1fe2ea…

MALICIOUS

PDF

73.0 KB Created: 2021-03-24 22:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b7bd5e9ed6ecfaa1f090f4781d52469 SHA-1: 153336bcb93a40dfcbd63c4941c431a5d4762efd SHA-256: 530d511caa1fe2eab9f9f1888fde4fbb0bda8ca4d68516237e7c45773d5395f5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xajibur.ru/strik?utm_term=microsoft+office+365+not+opening+windows+10 PDF link annotation
    • http://kafidovomiguvo.mywebcommunity.org/29409264335.pdfIn PDF document text
    • http://moshon.space/ap_chemistry_redox_reactions_worksheet73t1j.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/sahih_bukhari_in_roman_english.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/how_much_is_stephen_jones_worth.pdfIn PDF document text
    • http://lutekorudafu.iblogger.org/autotrol_water_softener_service.pdfIn PDF document text
    • http://copyrightsupporteds.com/nakamichi_bluetooth_speaker_manuall4ji0.pdfIn PDF document text
    • http://kixamugefuwa.22web.org/education_city_user_guide.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/what_is_importance_of_corporate_social_responsibility.pdfIn PDF document text
    • http://apsdd54gfv.xyz/passtime_fish_house_menu0pbjy.pdfIn PDF document text
    • http://natfreshik.fun/masijazegivefijosxsb5j.pdfIn PDF document text
    • http://prosucre.pro/como_se_hace_una_fotografia_documentalklbis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewetanetoza.atwebpages.com/laziroxejedag.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_4b65250703e8426ab53628b58146165e.pdf?index=trueIn PDF document text
    • https://b32e410f-f365-4205-840f-53103702c783.filesusr.com/ugd/51ece5_bca25abc236e424bb7ad1e30ee0fb55b.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_837ea9c0ab474cd6a54b2bce32fea2f9.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_4b729b596d4f47c2adbb394d7e713650.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_3e72feea6bd240d3bad142d0db1a2daf.pdf?index=trueIn PDF document text
    • http://bezegorev.epizy.com/free_construction_flyer_template_word.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 5812 bytes
SHA-256: fd0900733d1709fe2317a4fba3415de8a6bec0380dda51da2b734af436282553
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10236 bytes
SHA-256: 77e8031531090cbf3b3cd2e197ac05cf8483fa88a8c087ac25eaa289d10a5780

Open this report in the interactive analyzer, or submit your own file for analysis.