Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df7b118f591b4a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 13:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b3c39643b56d81435483d8662aff48d SHA-1: 5d50708daacd1fafa5562fe0c982f7a211d0a6f3 SHA-256: f1df7b118f591b4a9e16a23fb4d1b114d27132ca8a9358e3c4f64869a948aede
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://mxag.com/upload/browse/file/95380802586.pdf In PDF document text
    • https://samuelben-horin.com/userfiles/file/38296335795.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911185651143897.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/tepupelunuwov.pdfIn PDF document text
    • http://sdes.in/uploads/36142874369.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/vovumalalopobuliz.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/topitubefefis.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/puwasomu.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/3849802577.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/fabiloxawonikufaxos.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/pusilarasikusado.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/mamasutakotogexirumexuk.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109150656556279.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/67ff44dabdbc3692bb2dc98c0e62fdc4/82845404883.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/9847726041.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140028e738d6---13669800549.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/65810712433.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210911_C89DA0F0BA18D65C.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wanufotusagasek.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/64708034999.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/felogulesuwazenefipus.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/51983124532.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/litabotese.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nukowajodeforulobino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=getting+over+it+android+apkPDF 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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 10548 bytes
SHA-256: 0902f222d19cddc19f7a82278a48313d52e1802c5457d00c75da86eb498cd6f1
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 17464 bytes
SHA-256: 907cefc8ab97fc1305ec9ee5f0c3a913dd1f0803cb5c7d0ae8990d064b7ba9fd
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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