Malicious PDF — malware analysis report

Static analysis result for SHA-256 62479a9a7f84b41e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 18:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cc283455394796cb929517b27ee39c7 SHA-1: 358c2208e277fba634b2864cff96d16a8d767f84 SHA-256: 62479a9a7f84b41ee7c9298812a92c549c779385022577d13e5e1b8012c56bbf
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and numerous external links point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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://hangnhatbanonline.com/upload/files/nukefukixek.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2f32a5db---muwovukubovadubeg.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/21329354598.pdfIn PDF document text
    • http://methese.com/upload/files/54513729205.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/12717596034.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/33947605571.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/27575581095.pdfIn PDF document text
    • http://qdjshg.com/files/file/97447848427.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/lifixaporulirososefanofa.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/90827564902.pdfIn PDF document text
    • https://dhesient.com/media/gamupuzafoluvazefopiva.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///21141059080.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/66998217910.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vixajetadedizojelavoxid.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kotuvadomufude.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/32316042118.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zagukaredulidulexi.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dobogujisejifadore.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/71054062516.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/45467957825.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/29489906555.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/xunugit.pdfIn PDF document text
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/nanuwojunewowatumazo.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/luvedawin.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/dilitatojukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kuis+millionaire+indonesia+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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 17412 bytes
SHA-256: 7ed30632ff0f7ac8679e9f14d4e77c5a9297b1d8c92c3ba0de809573c1bd080e
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 10404 bytes
SHA-256: aec70dee74d95a30d4a4f1f9e2f910d02637122548eab5d60475159b11bf5905