Malicious PDF — malware analysis report

Static analysis result for SHA-256 05451d9e76060a15…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2118e53f8aa1fe555b946c7315babe7b SHA-1: e1ba56fc09984243a6c0f58dcc09e97fd333ae28 SHA-256: 05451d9e76060a156e122cced2e76524f764319d7799f7f9a5d36753fae5babf
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 0.9974

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://synerhu.ru/uplcv?utm_term=android+phone+hang+solution PDF link annotation
    • http://daisytalavera.com/userfiles/files/9393941329.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/94477402042.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zuvonifozelakegamod.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dimapobaxozejino.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vexoxemej.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d316ded8---govafijigokodowufila.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/lirigoxogejoxivafu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8487335832.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/76440149204.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/riguwewozilenolilaloxep.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/75126078650.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/womijajagakiwolomapikiwev.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/1411512820.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/31867237833.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57239122401.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vuwigibipibuv.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zurubowaduxes.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/47795581692.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/44596998547.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5152486675.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fabipigenalowifib.pdfIn PDF document text
    • http://novichiha.ru/pic/file/47294661886.pdfIn PDF document text
    • http://koddous.com/userfiles/file/ritolam.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nuluwalegasarunusularusev.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10752 bytes
SHA-256: 0a3b063c0b34d3abad85802f9bb03e17de9959a7f695a764c77ba3d91da758e7
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 18064 bytes
SHA-256: 077650653842f2ed93199d54c0b7a95f180e7695b3991bbd12a618ddbb9ba38d