Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c5d63f1f493e10…

MALICIOUS

PDF

85.9 KB Created: 2021-09-25 15:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b38d04049c5d40c2d5a2c3edcb6cf167 SHA-1: 39db136b8c9a12d282fc861d5900245919fc2088 SHA-256: f7c5d63f1f493e106fbc43b74a2f467112a17fef4f4f78659d60ad53fdcea11f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to be part of a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are commonly used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bestapp4u.com/admin/uploadedfiles/file/jamisowerorigan.pdf In PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/3525167937.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/18672498659.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/70474881128.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/vavegadabepadawavut.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sififijabomoporejolapoz.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/10163651626.pdfIn PDF document text
    • https://derfo.info/resimler/files/xibujakivutikefikinuf.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/romisosova.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zulomenokaremunexebeka.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/47355257937.pdfIn PDF document text
    • http://efrex.cz/files/file/46143913599.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/24732482423.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/62274796306.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/naxuxuz.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e8af41f---58183117615.pdfIn PDF document text
    • https://gyvatukai.manovonia.lt/images/files/74074280288.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/gewezalamogovukinijonezij.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fusev.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/84225123505.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/61728382741.pdfIn PDF document text
    • https://birotex.rs/images/files/21240142715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jak+zrobi%C4%87+swoj%C4%85+aplikacj%C4%99+na+androidaPDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 11356 bytes
SHA-256: 50b4fc8e190654c6d49e30693cdb008d5a25d9207bab6d92327072c7a35f4af6
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 18284 bytes
SHA-256: c9bf5a1f5dc8623f11788377d38430324911ec3ecca2c8e84552e5647401cf89
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.