Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebb354dfe07e72d…

MALICIOUS

PDF

82.1 KB Created: 2021-10-06 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae509df10fdb4b34a76e8685df9b1e82 SHA-1: c8a1665d06122bde54ab0b77e946c76cc401b2b8 SHA-256: aebb354dfe07e72d5f94b5cb75c1daec31f91dbb56536633776c11869cf563ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inciboya.com/resimler/site/files/joketuk.pdf In PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/18370824850.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8f586eb2---wamumukirekuvufaxi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/60248757681.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/82726694432.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109100633233462.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/68628165663.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8833056826.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/dimifexudukuja.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/14202200069.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/nomalegu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161428667e4958---96645489244.pdfIn PDF document text
    • https://digireg.gr/upload/tovesepimu.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/41375751047.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xikakaraxap.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/46059991056.pdfIn PDF document text
    • https://forumsevens.com/images/file/77973164486.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/98657581785.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/dimugigi.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/vofudawuminubobuvegijasi.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/wujixekopejowebot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=traductor+danes+a+inglesPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10608 bytes
SHA-256: c3d186c93b7c90e2f2052a9d9c79a6c72cce943ce956bb072c33ddd5734ca100
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 18460 bytes
SHA-256: 329da9e7f8cb0b35f1618509b7750233be3b9888fc526db90d74c2422a29dc0c

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