Malicious PDF — malware analysis report

Static analysis result for SHA-256 203f9e8469315d82…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 06:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e35530e2c14c5ed42cdefeba3086195 SHA-1: 135b152f309bc6d1add0cae3d83ef5c5406f27c3 SHA-256: 203f9e8469315d824c89e68a6aeebeb1c1c8963e1201edffc0b9fbbd9e402b59
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with several heuristics indicating a link farm on disposable hosting and algorithmically generated URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8235f285---voxikisavifogaze.pdf In PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/nijajededuletalage.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/wabesazirarobovupiz.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/85247161459.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ef97a0b4c5f84e283a3ec370228d5d1c/72392628591.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/timesukutizawog.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/58753146611.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zedadufopododames.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/figudukefufawudol.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/32970652688.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905063142.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612f0dc71cf9b.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25035112844.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/guvilimo.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/zanajemume.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jafubu.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisajosegixapulaj.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/63342876194.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/bedemodafaxed.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/zoboxe.pdfIn PDF document text
    • http://iknow.pl/files/file/sijaf.pdfIn PDF document text
    • https://apra.pl/files/file/25066519869.pdfIn PDF document text
    • https://kratky.eu/files/file/daxinitega.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/20990929800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mindpal+app+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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 17552 bytes
SHA-256: afa3419334525bde02066452488dc90ff9c1fa65ee7ca9346b0d17ddae624e0d
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 10100 bytes
SHA-256: 7468b93d11ed983d7c10ca1a6cbd5adf5b5a3e85bc83ef596c4dfae87ccf8f51