Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e01e1de347943cd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 23:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4445e592d8db4527563fdf23441af544 SHA-1: 0b674f57688ccd6ac038e89e1747d5bf2ab72c2d SHA-256: 2e01e1de347943cd47891ebef15c8d8239a1ae77fc7f237928b0886233d1759b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://chungcungoaigiao.vnpec.xyz/uploads/files/lomedu.pdf In PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/9913577796.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/11586882798.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/54404623341.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/gamuzomegub.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902164412.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/26367254816.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/85464189804.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/20334706970.pdfIn PDF document text
    • http://vpsystem.com/files/fck/sigaped.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/90594708809.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/93773262925.pdfIn PDF document text
    • http://dfanchem.com/upload/files/gevafoxawu.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/latejefo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/mixopoditikedifiberunis.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pivavejamuwanasiw.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/93718507691.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/47956166105.pdfIn PDF document text
    • https://shevian.com/images/file/jewun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a72ee435d---27018946637.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090604544473499.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903122840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+system+app+uninstallerPDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 17496 bytes
SHA-256: 80701813467a3694b6a460c6972789226bf6aa3e6f0851c1df2ea6cf940590ae
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10560 bytes
SHA-256: a0d09963dc6ad602fdb801f4cbc6171d083209ef778d259d91d36a4bdf65cfa7

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