Malicious PDF — malware analysis report

Static analysis result for SHA-256 b009672abc6a1ce5…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2231aa5bf4fccb1d58c4c3c42f25d531 SHA-1: 9fedcd89a1faed5933356076c8ccd444fd4b6e14 SHA-256: b009672abc6a1ce5b45e1fb2f59fe21c208ac26bfc12c5ac88df4afe08d07bc9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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 http://ventiliatoriai.lt/js/ckfinder/userfiles/files/52408655718.pdf
    • http://wujipacking.tw/upload/files/ladinudimekuj.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/8987536011.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/zogewex.pdf
    • http://firegallery.ru/img/upload/53649937817.pdf
    • http://globalfeedindustry.com/upload/files/33715790583.pdf
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/21363783396.pdf
    • https://aynadakikemalizm.com/resimler/files/76640825384.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614379742bf84---xixotapun.pdf
    • http://tinhotsaigon.com/uploads/files/15505225587.pdf
    • https://accu-split.com/userfiles/files/54431035711.pdf
    • https://dadesigning.com/daduserfiles/files/rivazesebazefuwira.pdf
    • https://red-adlay.com/upload/files/nupunokuvegepipujufedub.pdf
    • http://pegastelco.com/pictures/files/dulus.pdf
    • https://terminal.hr/userfiles/file/kevarig.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/xopolajodubivofovudazuv.pdf
    • http://czpohledavky.cz/userfiles/files/mupebufodifaxupeluki.pdf
    • http://vocal.bpv.su/content/files/files/kipisodikolox.pdf
    • http://kdwatch.net/upload/files/2021091704594970.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/kukel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=stream+4k+movies+free+app
    • 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_off00010ab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 16792 bytes
font_01_sfnt_off000122c3.bin
53b0d96143a6aea1cfa1b56e93a58b10e69ddbd9c5561fa74899108e75429717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 18516 bytes
font_02_sfnt_off000152f0.bin
05791018934a68c501535f86a46f6edafcbf03fa63c5af72e309faf9e0414181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 10680 bytes

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