Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b0241d0d0a2ffd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 00:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 521f9faac2a5aede98b17050dfa7cc3b SHA-1: fe9a620738c4b4c5a914b6a11ad0f3d72c1b8727 SHA-256: 45b0241d0d0a2ffd1d27ec17dd99d1156b534e624b6aef12620bd95bdf15bbb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://cabinet-blin.fr/ressource/site-image/files/wagixolovozekimedu.pdf In PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/12880989446.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/91162233536.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/61907083564.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/nuzowalelot.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bofefutexa.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/42200499965.pdfIn PDF document text
    • https://proxus.nl/file/jikobikes.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80521425463.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/15155989283.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/losarevikomobunuwebipi.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/77950197632.pdfIn PDF document text
    • http://pvvc.cz/files/vofavawixojawusorewurita.pdfIn PDF document text
    • http://trieuduong.com/images/Download/19076270905.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/fofekapavutafufixigok.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/koxerebekofa.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/51371884547.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wuxowa.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jobefu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/60514295262.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d141a8e8---63408287204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=macbook+air+android+emulatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 10688 bytes
SHA-256: 3caa377e4d4cafa177126c227ea321291656a4b4b1daa406b4c2895b6f649358
font_01_sfnt_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 16184 bytes
SHA-256: 7d25a2f9b1da484b5b1112320136e333538fc41163abe252be36e3840c1b147b
font_02_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 17512 bytes
SHA-256: 6d2658e03a56f9fde0867ca4d779dddbf99b2ca7bf447a8d6dbf92194fe2dd8b
font_03_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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