Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0470c7f6abe3167…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 15:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ecdf2a9b4001a97999a6f98be3bc718 SHA-1: 76e6a66adf3d56d056e153655c3e5ac96e03fbbc SHA-256: b0470c7f6abe3167d529d66671351c9410ac0618255c14765ea39247a023d146
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random URL links and being flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest maliciousness. While no scripts were extracted, the presence of external links and a visual download button lure points towards a phishing or malware distribution attempt, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://salonorganica.ru/upload/files/nipegefinunapawuxorawam.pdf In PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/72527885636.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/fojomunonuzozol.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lepolegodiwutogax.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/40274695892.pdfIn PDF document text
    • http://balone.net/_upload/file///wizoramesudamenive.pdfIn PDF document text
    • http://nut-shell.net/upload/files/lomufexokomoxabifuj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7c4abfd5---mavijexuzufilur.pdfIn PDF document text
    • http://iltorg.ru/upload/file/buvuvalalader.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mawemidifoz.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/15874962345.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/3259377121.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/15307920912.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/jazujenuwuxoriwaloxi.pdfIn PDF document text
    • http://poliinc.com/upload/files/13291868188.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/govigipaz.pdfIn PDF document text
    • https://angkagenap.com/contents/files/17625941547.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210909064922.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/jurijiturogakanoze.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/netafulofezepaligupemul.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/penotabapujinurapoxan.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/jodojagovobogurosidavuxap.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/nopazuwoxekif.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lisuronuz.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/dobap.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/41159986460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+apk+to+exe+onlinePDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 18204 bytes
SHA-256: 38db893956551d740064442eb276aef8245d884784ae58279ea00ad235c6993e
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 10368 bytes
SHA-256: 362209d047089c57e9cc86200a3c19b1c030cc25b7f1bfd38fa3b67f30d23a79