Malicious PDF — malware analysis report

Static analysis result for SHA-256 4622558ac6b9a48f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 12:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00fe1db6b40e8f2561486bc95433302e SHA-1: f1277c979bec1273afff1b4eb53dfcbcf6fb46f6 SHA-256: 4622558ac6b9a48f8ebc87adc69b290f577ae8f0f4cf215e0b4fb1d3c80f87e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://xinchenfast.com/upload/file/24599791537.pdf In PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/dazerudevojoroze.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909015220.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/kifawavixovobigoda.pdfIn PDF document text
    • https://123natura.com/stockages/files/jejixuzeveb.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/jojabuzutewukibakutugebeb.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/84396843002.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/gafij.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/39904411254.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/46707194737.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/biwolulavil.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913132211742.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/20977686277.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/527124493612f611c77b0f.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/74874430319.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/56324030555.pdfIn PDF document text
    • https://talaa-obour.net/webmisr/uploadwebmisr/file/javozutaguxofomejike.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6fc31d8188c14e07e3350248946d50b7/fuxuwasekobefuxoz.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/65877702119.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/rarironiruzaxefuxowedad.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/gaxeke.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/pokixevobidoxifamuk.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8631078a0---fezizimopizuvilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apps+downloaden+kostenlos+androidPDF 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_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 10544 bytes
SHA-256: 5584f7f9b569e5d15e2fc349dcd3ad6babc7dfc1779c14956cb41bb1a5a49260
font_02_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 17760 bytes
SHA-256: 4bd1279c42248e39be9ff8d91296adb8a52acb571068d7f4345302a0cb82c68a