Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa80c552b30f069…

MALICIOUS

PDF

76.3 KB Created: 2021-04-30 05:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b9a510bc6d7d0c0946199c54058bdd5 SHA-1: eb939e001782dc0b2d7bf06deacd6725b02e95f6 SHA-256: 3aa80c552b30f0696f348747d161f472f51e9a57ca7efc6cd07aba964c853af1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=what+is+social+research+pdf PDF link annotation
    • http://prizinsta24.space/76454883444i13bh.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/jokomoxe9v20z.pdfIn PDF document text
    • http://fewomazojuxed.iblogger.org/89877897308.pdfIn PDF document text
    • http://shoop-fh.ru/indefinite_pronoun_exercises_with_answers3uaaq.pdfIn PDF document text
    • http://summerita.fun/kanuxemiluruniravoiwqco.pdfIn PDF document text
    • http://pasetbs.xyz/why_do_they_call_it_a_speakeasy1mr2z.pdfIn PDF document text
    • http://aycotoro5.xyz/nobilod5boas.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/basic_zoology_questions_and_answers.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/extinct_amphibians.pdfIn PDF document text
    • http://onlinekartiadesi.com/lalimawanipuwapfdt3x.pdfIn PDF document text
    • http://fastdonwload.space/fall_guys_ultimate_knockout_gameplay_trailer8j0yu.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/add_an_image_to_my_header_wix.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/western_digital_wd_tv_live_streaming_media_player_remote_control.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/cakra_khan_kekasih_bayang.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://fagawozuwa.22web.org/bourbon_reforms_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosekipile.rf.gd/shift3_light_blast_projector_help.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/black_mermaid_sequin_bodysuit_missguided.pdfIn PDF document text
    • http://gafodix.myartsonline.com/yoga_poses_not_good_for_lower_back_pain.pdfIn PDF document text
    • http://benamow.myartsonline.com/administrative_assistant_job_description_sample.pdfIn PDF document text
    • http://jenurinufaka.rf.gd/dojevikeruwofopezexivugaf.pdfIn PDF document text
    • http://dufobilubaxa.rf.gd/kindergarten_worksheets_reading.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/aghori_baba_photo_free.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/98030766760.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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 5256 bytes
SHA-256: 20710c0152860dafe309a4aab4a022a37a6ab25ebb62b956ded81718f6d5e4dd
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10796 bytes
SHA-256: 3a4bbe6116a31323c34c984e2a44b52219727457d247c1fab5ce19022c43f5a8