Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b455e58b4ebc41…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1f8dd5783cdec1c18a8db38b0bf5ca6 SHA-1: a1281364b8fb3d13aa128d0bf4ba970318addb57 SHA-256: d2b455e58b4ebc412ba233f2d2c9bd870ed44cc535b005d84488f8889054e3ae
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing multiple embedded URLs, several of which are flagged as part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of random URLs suggests an attempt to evade detection and distribute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=how+do+i+copy+an+entire+text+conversation+on+android PDF link annotation
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/83232752731.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/14576113329.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/lifaruruxasusagixugixul.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/fawuvow.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/bakipigudilawedojugevamuv.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/87468564962.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/xorib.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/45647016002.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/jibutenadimibi.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2109121712484321549fzyu.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/94135147615.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/44552691261385ce8030e5.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/fegexitaj.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/36467939825.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614254c465364---37736838913.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210907_165800.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/telitavovusumes.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/xomasopumejefit.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vuxabizatekizob.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b393810c4---kapilazabixipotawile.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/sulelove.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/jagulaxidikobivopipero.pdfIn PDF document text
    • 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_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 10820 bytes
SHA-256: 92fe5038903bf591bed1f1da1c031e993287e82ca943287222aa3c34c4c0e81b
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16700 bytes
SHA-256: 597d2641ce2759163c474fd42fd6ad032611dfa5a05e71f7902c43b0d30f56d5