Malicious PDF — malware analysis report

Static analysis result for SHA-256 709fe7faf28f61ac…

MALICIOUS

PDF

100.4 KB Created: 2021-06-01 14:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d6f6c0b977fd3b99051ad292e6b4b8c SHA-1: f760b23ce9e3ca9d421bacdfbfd1ebb22cd9ff8e SHA-256: 709fe7faf28f61acb78d633ca76873bea9e6159f734872aa5a369472e09c8360
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://queure.ru/pbw?utm_term=harper%2527s+illustrated+biochemistry+27th+edition+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5ff76c93c76b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_600bf0d9a7aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_6039c176b3ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_601916e8b66fc.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/teragexer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fdd3c4d396da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_6034541f634af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5ff35b867b8ba.pdfIn PDF document text
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/jegegotof.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/tirere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fefcdcff2d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff689a2d41d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fca7d3db2eb1.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/c7a57.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/415f716012df065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fe53a3190055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144448173/rekuzelasojakaxu.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144441561/rusago.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144444246/fnaf_6_guide_steam.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/gifford-mcmahon_gm_cryocoolers.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144449511/55051340904.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/descargar_capitulos_de_la_casa_de_mickey_mouse_en_espaol_latino_mega.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014bb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14BB3 30380 bytes
SHA-256: 060c596af8c6af7f225c85ad60ef3bedf75805c95f6bdc6781e9cc81adc70452
font_00_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 5936 bytes
SHA-256: c96e980b65f2297ed1303dce9e0dcc219eb7b9d92a5363844044e375dc183104
font_01_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 11248 bytes
SHA-256: 2a72e4dc302d181d10bc2a5264acf3aa621de35b3535bddc716859ee221af788

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