Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb72da1c5e01ed25…

MALICIOUS

PDF

84.5 KB Created: 2021-04-28 19:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90292db66611086e590911ad71a7260b SHA-1: 23b64c3bfb3680240be923d7fd98beb33b5bf6ca SHA-256: cb72da1c5e01ed25ddae2c88352b788f43b60f0a413c547885f1dce46d01145d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URL and the document body text indicate a lure to a phishing or malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=who+makes+nordyne+air+conditioning+units PDF link annotation
    • http://qqkaxes.xyz/xobowefumuwavugonixunulsbiz4.pdfIn PDF document text
    • http://simcars.ru/what_does_it_mean_when_it_hurts_to_look_upyibrf.pdfIn PDF document text
    • http://wordsidepost.top/54923231639x1sgy.pdfIn PDF document text
    • http://d2-club.ru/p-type_semiconductor_definition_siliconu7xhy.pdfIn PDF document text
    • http://juwapes.22web.org/basic_bookkeeping_spreadsheet_template.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/sodojogareworogifewolu.pdfIn PDF document text
    • http://banque-populaire.best/t_mobile_5g_home_internet_plansazrp1.pdfIn PDF document text
    • http://submonster.xyz/asp.net_mvc_example_websitesob34.pdfIn PDF document text
    • http://eglo.club/logurexawazibazev4gcpk.pdfIn PDF document text
    • http://italiahot.space/how_to_prevent_vertigo_episodeshia1e.pdfIn PDF document text
    • http://jorodija.iblogger.org/vobazutapidir.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://resaruxowepu.epizy.com/vaxujovikilosijugejerax.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_c2bb2a21831244499aa0667f3f43def5.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_7934a8ed25e94f40a0d39158f5e2bc55.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_e386c4a9bb514539a325284be7ce91cb.pdf?index=trueIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_976aa573e41c422ebb22ce7a8912b2a5.pdf?index=trueIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_580ac5f952bb47d49147fd5d4ee643d0.pdf?index=trueIn PDF document text
    • http://baviwawuruxok.epizy.com/jorge_basadre_biografia.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/what_is_service_of_process_new_york.pdfIn PDF document text
    • http://vixugow.epizy.com/outlook_newsletter_email_templates.pdfIn PDF document text
    • http://jopinewo.epizy.com/bike_racing_java_game.pdfIn PDF document text
    • http://wamovesomawegun.rf.gd/dr_brian_weiss_many_lives_many_masters.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_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 5380 bytes
SHA-256: 52119401f4a39984723c6a78f637afa4259034c0167811ed9bbea7e6a7af4c08
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 11244 bytes
SHA-256: c90bac4b3a758167e5c4f9cc83abb7c86c0bec1f01456ba73d6bb5a1a98d753a
font_02_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230