Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ddad5f31804046…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 01:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bc45493394035b428ea5799d044fead SHA-1: 5c8d324ce0afb27a1982ae9ad58edcff5aba4ce5 SHA-256: 28ddad5f31804046fbb6fa126fe821758273fff31cce60db2404999b5d1d57ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://infrive.ru/uplcv?utm_term=best+alternative+sms+app+android PDF link annotation
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/gikivij.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/bolidugalowunegus.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/fekumojuri.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/47009545026.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/70184627515.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/57154722708.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/44114839553.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/74417242227.pdfIn PDF document text
    • http://unseretochter.com/images/file/fanudev.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c54ee485b---wazixezoxilanuzow.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/59538891690.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090916362549.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/85370671290.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/15004368177.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/kuworimobexefax.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/guxokileritot.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/vimanutuvovixa.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/famipidi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919153340.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/wigojixeziruk.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/32545516043.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/10351091814.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_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 18056 bytes
SHA-256: 3fb27cdbc67308522bbc815821d56fc49cd55bca17523501f652ceb5142bc07c
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 10672 bytes
SHA-256: 338fd8559123d26fc56e44ef19fb4e5c3e1280b4952338df2bce491765e1c1ae

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