Malicious PDF — malware analysis report

Static analysis result for SHA-256 757ef6731a9ff059…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 00:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 560dbbd00624fbca7f8852016c1ca58a SHA-1: f01b03b8c25085a086903035de57bff73a450c6a SHA-256: 757ef6731a9ff05980db70dedbf82ec4384229febb0654e3f370153a92aa3be8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host or link to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://issaproject.com/app/views/panel/ckfinder/userfiles/files/gixisijatipojuvofebikura.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/14376395818.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/duvasofemibedoroximenela.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/xowapawotoxoxedepotep.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/92479461207.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/potukejobubixofugewofun.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/71471743631.pdfIn PDF document text
    • http://mobil-tech.com/files/bepetuturuzoja.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/62632907556.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/53703101621.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93326523185.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/75203575366.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47512694429.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/88549098270.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/73108337966.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/14791340374.pdfIn PDF document text
    • http://skia22.ru/pic/file/domonoxovezimedizaja.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/25525567561.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/71435232247.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/95807853051.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/36454745533.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gosuronotijur.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kemiwavuguzupaj.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/wolopoxenozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=respawnables+hack+androidPDF link annotation
    • 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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 10876 bytes
SHA-256: b1950370f3883925f6ef8de0a60c594be93a78383e3403ecb5740274f2352617
font_01_sfnt_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 15248 bytes
SHA-256: a980e1f18493086c670882a555b7b934036b52dcc4155c51b96bffef1e240409

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