Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1072246e12c93e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 08:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 265a9b1a8fef52f2ff5287a257083131 SHA-1: cdabd62b3fd7f67dd5cc7e885ede02fcf49e0c7c SHA-256: ae1072246e12c93ee7574d50d322544a1ead77a5040c9d12b837635d5b5506b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with a high-confidence finding of embedded JavaScript. This JavaScript likely facilitates the redirection to external URLs, as indicated by the PDF_URI heuristic. The presence of numerous external links, many on disposable hosting, suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad203f64---lemabenit.pdf
    • https://chingchia.com/uploads/files/202109101403288800.pdf
    • https://kaskad-74.ru/images/uploads/25300267217.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/16762567627.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/gijowu.pdf
    • https://emmaushuis.org/pages/7903873411.pdf
    • http://elosc.com/upFile/file///ITX202109100321595244.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99b283dbc---73562297152.pdf
    • https://navliecky.net/userfiles/file/dimorarinovozefo.pdf
    • https://masini-de-ambalat.ro/images/userfiles/fumawe.pdf
    • http://bioaec.com/userfiles/files/lojamanetajebolav.pdf
    • https://gifarlcm.com/upfiles/editor/files/43108944407.pdf
    • http://zamdq.com/filespath/files/20210903055427.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/6733948085.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/vadikemavij.pdf
    • http://heydarbaba.org/resimler/files/disulejizulokuserunigowap.pdf
    • http://auto-spec.ca/fck/file/jojibosekuvivu.pdf
    • https://signatureshreyas.in/userfiles/file/43959637615.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/fosulafolabemogobageleg.pdf
    • http://vibestedu.com/_UploadFile/Images/file/46617528430.pdf
    • http://dispensapertutti.com/userfiles/files/13182522640.pdf
    • http://1hozain.ru/files/userfiles/files/pipuzurajodugifo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+long+is+raw+chicken+in+fridge+good+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 16792 bytes
font_01_sfnt_off0000ddc1.bin
0f1c96a0b66454a0567de4678a594b10fd2fef75e5c9d9de2a68103817eed1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16272 bytes
font_02_sfnt_off00010748.bin
66bb15a63c46b15841fa5d0939b9884e4fd46988aaece70d817bb66b46609ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 10828 bytes

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