Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aefe15f3de5c5ea…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dae5da2c528935fbb32c6ef693d541c4 SHA-1: dd80a8287a67cc0548557e5ac4546897ffeea4e7 SHA-256: 4aefe15f3de5c5ea0882843f106adcb4bad0d3645f4e6edfab1cf4dc7e3a6fd1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chinazzjx.com/d/files/kifubam.pdf In PDF document text
    • http://richardchong.com/userfiles/files/watavimufuvomegutusap.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/73702910758.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/fitegijusiwu.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/18943621659.pdfIn PDF document text
    • http://paradoxine.com/upload/files/tedozobuxare.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/50765303341.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/dupuregagepigeva.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/24055375068.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/maraxisubetofigevutusor.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/52661697183.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/448de7de2bb07c8c6bdf9fada1b5aa99/53693625923.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/bunijoxunedilitokon.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/59709298.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wadifu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/jopafolixitufabe.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/61446788639.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/63705997698.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/43133346460.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///94151816486.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/guvaredurarelowopanexexa.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xowetamovuzejusokobikam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=assassin%27s+creed+identity+apk+free+download+latest+versionPDF link annotation
    • 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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 10984 bytes
SHA-256: a7c8266e7b211287c75a1e3f1de2eeb547c92472cfb6d1293564eb798dcebdad
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 18176 bytes
SHA-256: 0735b0244fc8bb62dec38cd263587e947e16978b41ddeba8fcaa32497873dbd9

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