Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b978c70ea7ddf2a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-10 19:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ced5dd45cd16e04113cf7b4cfeecbc80 SHA-1: 060d6b8ef39001ef29976cd239220df44fbea67c SHA-256: 0b978c70ea7ddf2a7ab40489bc735913b751086c010de90f9e5e05ce46606dac
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and links to external URLs, with several heuristics indicating malicious intent, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS classification. The presence of a visual download button suggests a social engineering lure to trick the user into downloading a secondary payload, likely the PDF linked in the random URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kbchina.de/upload/mererowizirar.pdf In PDF document text
    • http://nhactheducthammy.com/upload/files/vadixeda.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/zupezazovuwazin.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2dec170---25658543088.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wawalaratalapefeditinapo.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/xunavopeviti.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zufomi.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/vumadivibakewubu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/winilizoxuliguzopevu.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/21064504456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384110da4ca---sugamufefefa.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/23392107937.pdfIn PDF document text
    • http://twilaw.com/files/files/lofelaxo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/22337173685.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/52409706546.pdfIn PDF document text
    • https://digireg.at/upload/wujefi.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/40965193325.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/59065780879.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xobod.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/komeberudemotuwuf.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42663174874.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/girogidiguwaki.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/59112203052.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/kejewamazus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=strategy+games+ios+freePDF 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_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 18212 bytes
SHA-256: 5e3c42c69b74ebc30c82baab8eb4b04944309fe3bb1ac81d75db7f166f7bf6fb
font_02_sfnt_off00014f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F71 10596 bytes
SHA-256: 25f5095795704550642666cd719df658e656145aab023ff4109832ad4c3de8c6

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