Malicious PDF — malware analysis report

Static analysis result for SHA-256 da528de62f83215b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 02:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d09cf591cf7ceb8f3394d39cc1ba9e12 SHA-1: e29d9b428dd4e2c6479875b4636345dd19f3b6db SHA-256: da528de62f83215ba1720d3322fe802d5afe7c4d64fe7bbe563deec128cf8d46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an initial access vector via spearphishing attachment, leading to redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ferado.vn/userfiles/file/41722525162.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/95821051808.pdf
    • http://ajtoablakcentrum.com/_user/file/bijug.pdf
    • https://sunnyvale.com/wysiwygfiles/file/73987079824.pdf
    • http://hadt.vn/upload/files/14495427961.pdf
    • http://laibros.com/ckeditor/userfiles/files/83384575762.pdf
    • http://skupka54.ru/upload/m/81889908267.pdf
    • http://machinesupplier.cn/data/product/file/2021916_1148_947.pdf
    • http://zjqzzx.com/uploadfile/file/2021090414530273499.pdf
    • http://bdn10.cz/files/file/tujugewaji.pdf
    • http://iproperty.ae/userfiles/file/10366595173.pdf
    • http://gdgom.com/upload/file/2109050151377549633jw3mim7m2gp.pdf
    • http://naszymsladem.pl/upload/file/71873957546.pdf
    • http://sieuthimaynhapkhau.com/upload/files/guzawepapobixaj.pdf
    • http://razzledazzleevents.in/userfiles/file/garukadisemeruwosugi.pdf
    • https://penal-garazh.ru/files/widuvojosuti.pdf
    • http://dermalab.pl/userfiles/file/bolofenesinekupeb.pdf
    • https://napraforgohotel.hu/upload/file/wugirizosexigebowatavibiw.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9150086636.pdf
    • http://gostinica-domodedovo.ru/files/sajuxuwoxejumufovelafit.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/92683438648.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/vomixa.pdf
    • http://insureavisitor.com/userfiles/file/waxenatixarafubuwatafuwi.pdf
    • http://georgewongdesign.com/gwd/upload/files/74367080503.pdf
    • http://robalton.es/Albums/images/file///11332414443.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=team+sonic+racing+for+android
    • 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_off0000bd92.bin
dec9bfcba8c1ab795f5e6df44210348488a114701f4e404e8c62abb07bcfc17f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 17548 bytes
font_01_sfnt_off0000eb38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16792 bytes
font_02_sfnt_off0001034f.bin
92ba32611cf68a843c37e60aaca876f48f5c6b0e731422bb8c87c034c3de64e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 10636 bytes

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