Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b7e07647073bd4…

MALICIOUS

PDF

106.4 KB Created: 2021-09-21 07:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a022802b9cb395abd82783b5eed469a5 SHA-1: 822d464301238d83f8fedf6d33ab72c6606cd174 SHA-256: b1b7e07647073bd438d85d3eb8883456958fb204011430fc0c27b6f0f4f55cd1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'infrive.ru' and another identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=rhythm+hive+download PDF link annotation
    • http://ayurveda-shiatsu-nice.com/upload/files/fuvulelokim.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bed8f080---94110694804.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/teredelu.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/90008135539.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jurerowolibomuz.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/rorokifedirikadamurufoja.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/59503085716.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tudalanarapuga.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/80655135542.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/raruz.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/16957884804.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/40732569095.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/82494906454.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/33320463798.pdfIn PDF document text
    • http://idcla.net/upload/files/gitexawozezuluketobilexu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/bekexobeju.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/9533040828.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/mabotuxixegosotebod.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92030313059.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/61739678697.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/89c007b4b0a2f1e4dcc3ef94697a3c47/garoxigewurinufok.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/28504118932.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_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 10556 bytes
SHA-256: 98cc32bec8560a565ac96a4de633af52ad9456918b4a3e5c88befdcbcf9661f1
font_02_sfnt_off0001691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691D 19392 bytes
SHA-256: 43e26640feb302fd2e60a2f42ab82bbaebad2cd6d7a1115bd15a26fdd7f7122a