Malicious PDF — malware analysis report

Static analysis result for SHA-256 a206b729477696c5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 16:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a896774e78fef7a000cda155c1f9768 SHA-1: a7cdac49aa7ba65ea06b07e7825accccd330bfec SHA-256: a206b729477696c5f23fe5881cf2886a3a1c88dcbe1cf3360d366d598ac9f2e6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, including one pointing to a suspicious URL with a 'hack mod apk' term, indicating a likely attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of embedded JavaScript suggests it may be used to download or execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=toy+defense+3+hack+mod+apk PDF link annotation
    • http://wolfpackbasketballacademy.com/content_docs/34262227060.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/45026766234.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613878954222c---93160128628.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/83999589508.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090910081988.pdfIn PDF document text
    • https://polytex.de/sites/default/files/21846505514.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/61918190321.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/veroxajogopokeraramam.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/zogogaxegoxavino.pdfIn PDF document text
    • http://kftchem.com/upload/files/wosisumu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613013ad605c5---30521217662.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/90864544037.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/32406627531.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/pekez.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/82537061946.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/44237244586.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/16594730351.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • https://aspirans.com/files/file/winanofuv.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/35847571087.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/19781954918.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wumibewilawonigukanurano.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zutemimemato.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/motisegegolesexivatoku.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_off0000c867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 10888 bytes
SHA-256: 47f51bee04282364a8388d822bad8cd4cadb56d11e60ee57fb108ed980709e4c
font_01_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 18224 bytes
SHA-256: e6f2cf0b15b148fbd98d5803ebddf4beaca205ffb87b939e646c8e41e424db92