Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22abc72fc9add82…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 17:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13d343c245a1c5b640e03974d8e28396 SHA-1: 63689a65b89ae5ca0a2036d79dad385e54a5ff48 SHA-256: b22abc72fc9add82ab81733b11f5d3fa885f8ab250354a196e37311788a639f7
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable link farms pointing to external PDF files. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://cnwt.mgo.cool/upfile/files/2021/09/02/juleguwunena.pdf In PDF document text
    • https://nedimgame.com/calisma2/files/uploads/63830524791.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/10044323826.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zatogabofodu.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902125022.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/99001700722.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/wesakaxura.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/koderopezat.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/63255197647.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/48967030142.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/nomifuzem.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/susefovizujinusetu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62432452362.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/nudajujabikofo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/41833269672.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/61807813498.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/10678749169.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/kolixo.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/68959824236.pdfIn PDF document text
    • http://klenderbio.com/upload/files/22255324420.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5397c41c15427639ae5a6ac620e47e2/99753018362.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/newezefobokigexezixama.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/24684579465.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/26516620901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=maniac+mansion+gamePDF 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 18936 bytes
SHA-256: 9ad249f3d1488a78daa43046d1a82dbbd89986511371b1d38b4cea1e6100e33e
font_02_sfnt_off0001482b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482B 10324 bytes
SHA-256: 728df2f647cbbb34894a002d36a31836afeb0d0b56d9b288da572cf3cbcd7a36