Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa00936fe0d7b9cd…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13be4f523b8654cf5f0f37754105ffb8 SHA-1: 21dc80411c521d5525953a096dd0db677c5b8f37 SHA-256: aa00936fe0d7b9cd1ed813eec62ad8549bebf337a5b377632a714f83417047b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kangmeideyiliao.com/uploadfile/file///2021091402172811.pdf In PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/gutosawaxuvibodomanizu.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/18384187936.pdfIn PDF document text
    • https://novsport.com/content/File/2156697876.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/81283475418.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/29706340593.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mulurevepib.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t7sn7jmsu7hqt4pdhthj3kugn4/41940798175.pdfIn PDF document text
    • http://geraldinekilkelly.ie/34220925367.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/47726661347.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/galiganukibefi.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/63697360866.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/morij.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/magibewufopumobaj.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/11387457067.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/dexekudujoderegixezevapel.pdfIn PDF document text
    • http://4bx.pl/public/file/74611287959.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/rajupevesipedifewubuk.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/boviri.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/60379874517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=truecaller+android+app+apkPDF 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_off0000aa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA04 16172 bytes
SHA-256: 7acf272389e2edbc410c40ec97006ccdae36d715685211b001c1a7af9fdf3346
font_01_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 10396 bytes
SHA-256: 1af09b1929c609599d41988355a624723dd883611761052f31eb5a6b25b980a0

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