Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dca21b015366ad7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 11:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43bf75a98312eefbcce6d5b54784a4ce SHA-1: 9a99b1ed1bd0765058f1b66a6cf3b8b502f8b409 SHA-256: 5dca21b015366ad7cfea814c894b065e4f44a2aa1df3814fe40a26067c0bd97d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs suggests the PDF is designed to exploit vulnerabilities or lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a scheme to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3d7e6637d7ff87271f9b42631eb8d2d5/34667188957.pdf
    • http://bharatandcompany.in/ckfinder/userfiles/files/luvipesiforawofelomed.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/goromanexegami.pdf
    • http://polipack.ru/content/file/zexokusuname.pdf
    • http://arcos-eff.it/userfiles/files/91205742611.pdf
    • http://com123.vn/uploads/file/xaxuxusurizilafod.pdf
    • https://farmacieitaliane.com/documenti/file/5604187990.pdf
    • http://copingconversations.com/userfiles/file/1917086461.pdf
    • https://nls.vn/upload/files/tuzuzusodad.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/22025332135.pdf
    • http://tinhdauvietnam.vn/upload/files/jadubuxitovosup.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/96340052087.pdf
    • http://trunghungplastic.com/luutru/files/lapig.pdf
    • https://profitaler.com/UserFiles/file/wokabalopifumepen.pdf
    • http://pieseautocomenzi.ro/userfiles/file/70662125102.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/28309846233.pdf
    • https://zibarajabi.com/cache/fck_files/file/10856657386.pdf
    • https://likeevent.it/writable/public/userfiles/file/75660329388.pdf
    • http://www.huntsvillepr.com/files/files/lizakel.pdf
    • http://fecirturizm.com/resimler/files/68333161017.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/esh2kqd8kl7rea21hvjpm239s4/davevi.pdf
    • https://cremyco.com/app/webroot/docs/file/43480265478.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/papadujotafutuwojuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ipad+qr+code
    • 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_off0000b14f.bin
12e4a7b35aef77540949bc63c5cab9eb9e18a8bcd4efe8c0284c415c51fc7ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 16344 bytes
font_01_sfnt_off0000dabd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16792 bytes
font_02_sfnt_off0000f2d4.bin
ae602e98828bfbd5587d852554fb0b58c41d66b0e67d6ab7c64811f0e2a98e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10096 bytes

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