Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7a188fd4280f69…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 13:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6cddd10661fd18ea37316c90cad32767 SHA-1: 5e23debc79409d4d0dca6943dcc7fa73d31bddb5 SHA-256: fe7a188fd4280f69950db05b3d98ef7964f2f57ef7eb9d1e4e880d01414274bd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including a high number of external links, many of which are algorithmically generated and hosted on disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan delivery intent. While no scripts were directly extracted, the PDF structure and numerous external URIs indicate it's designed to lure users to malicious sites, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=find+the+vertex+and+focus+of+the+parabola PDF link annotation
    • https://buyafranchise.org/files/files/vesixanesimizaku.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/17583008619.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rorevevetisajo.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/22493602556.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/ridevavufunelexoje.pdfIn PDF document text
    • https://fasaac.org/temp/files/fapaloberereri.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/639533316.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tezukamedokasenosa.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/jamunaj.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/15740466529.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/bukajaxoxuruwukosobup.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/81856113544.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rasubuxef.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/divalo.pdfIn PDF document text
    • https://dcimx.com/files/73996086487.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/vagikevuneronajigisaja.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lepizaserajogasew.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/56869911434.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/33604174866.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zubimu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/67534843163.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/rajiluw.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fapofuvotesobel.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tizikunakixonejogolut.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_off0000afb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 15332 bytes
SHA-256: 430b287190ff55900e8d451a1a46fc508c57114e732b1c7cbfe7cecfd567171a
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 11100 bytes
SHA-256: 1b7fab6133c97e4442d930c84dfc31e70553a059c91111766be007a19b95de8f
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1