Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d2c456afbb69cc…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 08:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5402063f541255927be68fe6fe0fbfe9 SHA-1: e9392eb14d779767b25311c8f348f90b85552d67 SHA-256: 46d2c456afbb69cc77d4d204e0b0ad55651fe375459db019a900ae935dec43fe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristically identified malicious links, including one pointing to a dynamically generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to redirect users, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://andana.us/files/files/59416067830.pdf In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/41589544953.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/4678650279.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/tulanokavozi.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/rejorenen.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/29850654170.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/bonudal.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/18658315651.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/32186701266.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pokefowetuxekizopi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/dibale.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/61016194719.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/72256775539.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/94344574419.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/xurejudujemedomazitatapo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/30425218036.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/1579499395.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/77876327132.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tl5hrif622b5jvdlul3giuet5q/36400829853.pdfIn PDF document text
    • https://senegal4d.com/contents/files/firirikuxewevilewopi.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bazulu.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/60355925854.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_4FA40DA56A5AD131.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0352853001631356152.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_422288D42DAF3C4A.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/79198854617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+adm+androidPDF 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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 10100 bytes
SHA-256: 9b88c7ff6a4023b3cde709ce1569b5918c0f2209c7c0a902f2d9646413a9c619
font_01_sfnt_off0000c775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 14544 bytes
SHA-256: 5db0c3d08e5cbc14341e6b9aca2947f83d52bfd3e927f947c8e265109f5b22d1
font_02_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1