Malicious PDF — malware analysis report

Static analysis result for SHA-256 124291e0ba6648a2…

MALICIOUS

PDF

81.0 KB Created: 2021-10-05 06:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0deebb410367cb23f2b27fce2764a56c SHA-1: 6fe9aa7049355813892f5d4b5d5badcbc0051bae SHA-256: 124291e0ba6648a27852dfc11e84f7373d707c16cb5ee07df8cf633164375a54
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a clickable URI pointing to a raw IP address, which is a common technique for delivering malicious content. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the download and execution of a secondary payload from the IP-based URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613588d3079a1---detugosuz.pdf PDF link annotation
    • https://tnmkor.com/FileData/ckfinder/files/20210919_089417B871CB4ADE.pdfIn PDF document text
    • http://ed-union05.ru/files/file/ladovebafegapeviviziwi.pdfIn PDF document text
    • https://securitydm.com/slicice/file/joxozop.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/sugoluvojiwedojuxiwe.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/44067408278.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/74288367806.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/mubafu.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54997477643.pdfIn PDF document text
    • https://angem.fr/userfiles/file/giwuxaki.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/xikuxebubebomomapogej.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/9435330603.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zudejefunusewibixiru.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wemotuwojewoxog.pdfIn PDF document text
    • http://indian-sped.szabgab.hu/fck_uploads/pdf/30999691260.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/gujagidisifisomawedujiv.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46662934294.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/25721208049.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/18212590506.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zogasuxerupuxanivetigafam.pdfIn PDF document text
    • http://htygroup.com/upload/files/rikewasofuwavuxepufera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bsc+statistics+notes+part+2+chapter+14+pdfPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10972 bytes
SHA-256: 90c9214a3a93712680ba816e013194d6afad1685236df8fff9a4ab720193d272
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 18060 bytes
SHA-256: 4e319c6996a21b2b7f2efed3b6e6f72c32915542e00bad4ff45c646b433ceb9c
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1