Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7cbce96aa5fa1f…

MALICIOUS

PDF

82.3 KB Created: 2021-10-16 21:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 21e2415c9232372f7e043e5c3bb55b3e SHA-1: e05c4329c2ac9ef342d01120c3a967e780b20e37 SHA-256: 2a7cbce96aa5fa1f5d284d359e90b0f74ba36214507fad4888a84b14ed44c0e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tucsokszekszard.hu/images/news/file/99789801722.pdf In PDF document text
    • http://tuivaivietnam.com/uploads/files/wesinuba.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/ruvokonaro.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/378016295.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/ririlutaxewi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/97599129608.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/bimasafenopuluzodoveto.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wikaragetoga.pdfIn PDF document text
    • https://datawire.gr/files/files/molaxaxe.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414472d4744---jesuzedofaruwubuxazimo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/72256888894.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/moxewunozanera.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zebulipigobejugemifukirat.pdfIn PDF document text
    • http://msiutilities.biz/documents/zosigoxibedavinomeleti.pdfIn PDF document text
    • http://3m18.com/images/editor/files/91042117238.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/92423029239.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/88179212570.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kinokerawowubalibapeja.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sejozunosirik.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/buroti.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164218d5e95d---70461290183.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/28577213700.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/ginesab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=tnpsc+group+2+model+question+paper+with+answers+in+tamilPDF 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 18476 bytes
SHA-256: a2434fc6035bbdcaf4c185bd0d7f7e4b072015d21a095c16a92eb4ba4a07b41f
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 11376 bytes
SHA-256: c205933bdd509dac7e7175a1e4c4d04c50a22d265dbfe22f31763aa9ea283516
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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