Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21f7278192d7e8a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 70be94f3565aeb4b4f8377820a8c1c15 SHA-1: 9fa65cac955e25cd2a4aa1c525109586255d015e SHA-256: a21f7278192d7e8adec146a2c7f7d8406fc9a0f2905c7a874a287acc44a4ac7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614212b7a144e---susabowuledatoroxe.pdf In PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fejoxinevifukafavefukelon.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/pajolapufexarir.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/37758226111.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/67294460544.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/46942471462.pdfIn PDF document text
    • http://sjhtractor.com/d/files/wetew.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05ff05e9b---warilutanuvupojolalivagar.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/55029941114.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/54862872549.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/11067602269.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/jelazafominubiranozo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/romevomuvumurig.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109080819234395.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tetatukopofiveji.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/zefobezosokiju.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89129700063.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/11544646908.pdfIn PDF document text
    • https://linker.tw/files/zofifu.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/46189565978.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xesalipuguwabuvixiduxuru.pdfIn PDF document text
    • http://happy-land.hu/editor_up/wutozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=good+morning+gif+funny+dogPDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 18708 bytes
SHA-256: 14afa8920b993f3e008ae4d39bceea330a2d12c511bcadba079814eccba004c7
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 10344 bytes
SHA-256: 1cfa4e6be4e8221b40ec48baeaa48cd0fc9684a60aa780e1a7b8c87479fe4ae2

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