Malicious PDF — malware analysis report

Static analysis result for SHA-256 075287790feec3e2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 13:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cab180dffc60d56b10cac8fb4db3ac84 SHA-1: f8c09111929b9001e3d1ea8076e0b66a01e5f19d SHA-256: 075287790feec3e2435eb5a900470a15e31b928d8a1995d46bc1d5f837529c9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to facilitate phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://beldapromosyon.com/calisma2/files/uploads/mojuxani.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137642b3b322---27981144310.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/44920075843.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93379741891.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/lazikibevob.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613857ccdb925---bewejakopamoxotis.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/gigovamaluxu.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39191594234.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/penuvolesisedebobijok.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/87121961616.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/takiribifuzewi.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/69606147487.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109061704441439.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/dovapiwumegir.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/80034612798.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/47456076887.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/zalisezupe.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/90716293295.pdfIn PDF document text
    • https://digireg.sk/upload/karubefosaledujorov.pdfIn PDF document text
    • http://drironcat.com/images/file/757193677.pdfIn PDF document text
    • http://emaaravm.net/upload/files/10263343029.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/dexovakojizitovuwimuw.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89960291944.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lapejukagunusi.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/41962161503.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/bopatoxanopuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+marksman+movie+freePDF 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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10456 bytes
SHA-256: 29dc45967c7cf04b9b6df344d3cc998929d0c84138553b41c302fddd9971e9f0
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 17392 bytes
SHA-256: fd604f3e586511bdd6bceaef3052159c41b7d16fd181bcbf839f3f3c31ef923e