Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece43ed001a0fb4c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 19:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ef21a4adb05baed85b092b6d42cbea0 SHA-1: f378fa93a36d0ee602319b313c650b023eba3c6f SHA-256: ece43ed001a0fb4cf30e30341630a66047f34425aa3c3cf533ce220d45750524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dyccpharma.com/upload/files/87487403837.pdf In PDF document text
    • http://hyunshin.net/userfiles/file/678255843.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/duwetedom.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/4391321480.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/pemilobamilugawajuvi.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/4613055924.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/75486587719.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bodibulinom.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/57400632135.pdfIn PDF document text
    • http://tavio.su/files/file/petak.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bojesowug.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/61516291488.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210923200049_716132381.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/penapon.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/75207447728.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113fc45e53---daweruferofiro.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/57394205899.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/lusofatizaxadirolaxi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_C48DE3DF593EF381.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/92729889422.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/18727741727.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/movawonizofiladili.pdfIn PDF document text
    • https://pecintajp.com/contents/files/nanerinegarumusugew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=outlook+on+the+phonePDF 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_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10044 bytes
SHA-256: 1a52f6ae07a9b5f3aeb6bc39a08e989131fd40791cbd21aa892554a9ce913b13
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 18036 bytes
SHA-256: e7d5d37f8980e9a3b9eda6116cde8b267b4bd6921780ed713683dd8f81982c90
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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