Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d515f02cc00d9f6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 20:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f99f7c54b98708cc68e1ffdc6866e5 SHA-1: 4101d0edb1c0baaa26c439b7dd1390108e35a005 SHA-256: 8d515f02cc00d9f6a5352796a1ef64a7455f054e4abb27573929208942737282
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the PDF_RANDOM_URL_LINK heuristic point towards attempts to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=how+do+you+make+keyboard+bigger+on+android+phone
    • https://www.ojchamber.com/ckfinder/userfiles/files/gasikopenese.pdf
    • http://kameleonhastanc.hu/files/file/wewakigekes.pdf
    • http://smolninskayahotel.com/userfiles/file/88026126120.pdf
    • https://carlojans.com/cms/file/todobikize.pdf
    • http://maybomnuocdanang.com/uploads/image/files/fanile.pdf
    • https://artgreen.vn/attachment/files/fojasemubododijupenarara.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/gijupewivonobovorigizirol.pdf
    • http://delve-cr.com/uploads/vulomizuwitelenuwewu.pdf
    • https://yptea.com/data/fckeditor/files/sanonofogeradotebad.pdf
    • https://fong-cai.com/upload/files/kuzodezipowugosawamat.pdf
    • https://tavcam.com/upload/ckfinder/files/napupenazub.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nizuredu.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/62503683747.pdf
    • https://pt2-turbo-j3t.com/contents/files/pakifufususopotaja.pdf
    • https://termoformat.md/img/files/tarewezuvesikedanuzi.pdf
    • https://weddingitaly.jp/images/file/80814890647.pdf
    • http://ahcxdq.com/uploads/file/02072208649.pdf
    • http://deaprogettazioni.it/userfiles/files/javavupuk.pdf
    • https://terracell.info/images/file/jetusijuwebakixeras.pdf
    • http://korealabels.com/ckfinder/userfiles/files/bigivibikofo.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/81630334889.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/76800001573.pdf
    • http://tfforming.ru/d/files/walenerenusilagezumozafal.pdf
    • 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_off0000c8bf.bin
da65a8abc2070974a740574784cc9098547afed47b89100a21fbbf5ae21089e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 11048 bytes
font_01_sfnt_off0000e1c4.bin
377222fa1b0c0e4a0897479c284caf85587df52208e966d31f2f65e3d2755da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 17004 bytes
font_02_sfnt_off00010d8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 16792 bytes

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