Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5fee5c7b73d448…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 18:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b39526d36d7731d840a55920900c1270 SHA-1: 180c694c636dfda119564a1a5b3f8eadc8a68c65 SHA-256: 6d5fee5c7b73d448b1f30802d64c5c4687ec7f7440e0ab2b474ba3df96ed0b55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or distributing further malware. The PDF structure itself is also flagged as a link farm, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://allytemp.ru/uplcv?utm_term=how+to+install+rom+from+sd+card PDF link annotation
    • https://keongracun.org/contents/files/vasofufolinelosivapaki.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/pabade.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vizodepijizarixuzas.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/marakup.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18928867672.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/modunadilutax.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vajuva.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/putozopelotidefanetenove.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/11511588271.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/50733052278.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/nuvub.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/52998479268.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/47273752292.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/14594258441.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/7531511037.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/75069966264.pdfIn PDF document text
    • http://goldia.cz/data/file/5059452701.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/gelapinoz.pdfIn PDF document text
    • http://sinners-party.de/media/file/ronakisarobuv.pdfIn PDF document text
    • http://sungder.com/upload/rikudatetubowed.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/puworaxegamofo.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/nobep.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/88499839711.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/sigolemawa.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/66327490693.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 18884 bytes
SHA-256: 0549a48e21d771a9599f8298f02a2adbd495f15edb3917a89523115898ceed13
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10584 bytes
SHA-256: 0c10440d68d48d5df8b4ce19c8a4e0b0ab2b777a7675812477a1cd640ef5d431
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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