Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a444ebd80511a2…

MALICIOUS

PDF

86.5 KB Created: 2021-10-04 22:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2656e6a55f2f6be74212cc6138ffe44 SHA-1: 7be8e6fe09f5038d52262f55ad1bfc8ec1b83f6b SHA-256: d6a444ebd80511a2c4eac088382285862e066ed96a644c2aafa905b61c25e26d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=what+is+the+overall+equation+for+photosynthesis+using+words PDF link annotation
    • http://ridendo.cz/files/file/vowukax.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1632615065.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/73280272864.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/sipir.pdfIn PDF document text
    • http://teknis.it/userfiles/files/zurifosufegapig.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/28271547818.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/5062731007.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/nakewisol.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/kapatovilitapo.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/78069938314.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376845ab042---19605203576.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/mapulororadexumuj.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/betagilamo.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/81579330172.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/71677242766.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bc7cf0099025f701df8a7c3b4311c374/vuxopubetof.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/dexor.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/tizidadapavigosowu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/netolukawexutimedaviboli.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/famevaruwofuzogefanabiti.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/31794938832.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mejuxelusadefepowixezaz.pdfIn PDF document text
    • https://fq.ua/images/file/geruwevu.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 19640 bytes
SHA-256: 61cbfb7eafba7ebb9139f906b861b2e9d82476769d6436d0f1a272472f8ac8f2
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 11284 bytes
SHA-256: c22adb75e9d741c671095d4fb784088e7539d8236bcdc3b380102d283cd0bde0

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