Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3e23a870576fe9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 13:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2553c070bc3ab9528106be4799a7ddf SHA-1: 4bad648e8e23129c524ff78483d3d85f9322ddda SHA-256: 6b3e23a870576fe975a0cfbb387856ab85b7d162340b469b79c7fe78b072818e
216 Risk Score

Malware Insights

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

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into providing sensitive recovery information. The presence of numerous URLs, many hosted on compromised or disposable domains, suggests a phishing campaign. Although no scripts were directly extracted, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the PDF, likely employing obfuscated JavaScript or other techniques to facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://phuquytravel.com/nguyenvanlinh/files/mawizej.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/rofafapojujibutudaforoxe.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/36328876226.pdf
    • https://amrapalispot.com/userfiles/file/rafepipija.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/falefi.pdf
    • https://namkhoasaigon.vn/web/images/files/dorokabixojuxezanodugex.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/3239841624.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135226281fcc---samexulevomevebisi.pdf
    • http://locthanhwindow.com/img_duhoc/files/gometugekaxenawaxevazi.pdf
    • http://alnadaoil.com/userfiles/file/64624185287.pdf
    • http://tbm-mova.by/images_from_html_editor/file/52070695670.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/nisekebaximokazuxoxorubo.pdf
    • https://ibshospitals.com/userfiles/file/pinebugufepavixowebo.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140e33eb1292---vurisaxuxok.pdf
    • http://kibbkw.com/uploads/files/mesozisaw.pdf
    • https://virtualpulse.eu/UserFiles/file/90085548534.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614eba36556d0---rotexujexa.pdf
    • http://sake2metustin.com/uploads/files/89705451144.pdf
    • https://claudiodituri.it/uploads/remolu.pdf
    • http://freetds.net/userfiles/file/kovobojil.pdf
    • https://actsonics.com/uploads/files/202109011947093228.pdf
    • https://cvsc.co/userfiles/file/raxazof.pdf
    • http://sziszolg.hu/editor_up/rinosinitesipuwis.pdf
    • http://giftboxvietthuy.com/upload/ck/files/fugaruguzosamuxurogela.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=javascript+private+keyword
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b62c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 16792 bytes
font_01_sfnt_off0000ce3e.bin
825d7ceabba13108f4a477a3f578503bbae33c48df8ccca4429f4820b6b31926
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 19292 bytes
font_02_sfnt_off00010099.bin
b046e7b8312dcedb1a37762c62cd302ec1b2cb295c01e9dd01ba33eef4c43e9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10704 bytes