Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b97b9d30f5b63e8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 18:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0083035f6b23d0a8af36c7fd7ca782e SHA-1: 6f0718648a78495edc8b05beb387505aec4dac58 SHA-256: 0b97b9d30f5b63e8b621f74d847d38cfe722b3280df521b0de67a48701e30b29
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to disposable domains and are presented as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://airflow-skateboards.com/userfiles/files/23905171137.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/vekigogadun.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tiwowidexizuwuposis.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/50896715917.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/turugexolufibejefe.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xusodezuvolavewulerosawi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24521857950.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/zukegevutaze.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/zinevizomagosulikerozile.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/52966408710.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/buxerode.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/rivokenilunapafuxif.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/13366644926.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xedineteda.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c168f033---15677933860.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/supilefamizasobeziraz.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/27710486754.pdfIn PDF document text
    • https://afma.pt/site/upload/file/46563160545.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/57453926466.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/mapewaret.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109111453347061.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/vamanago.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zijuma.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/zapepogolenosiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=schrodinger+and+heisenberg+atomic+theoryPDF 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_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 11100 bytes
SHA-256: 43cbfe0de07c13df5b73014a2f63d5aaf8b934214d346a86fe3a6ab338a0d239
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 18392 bytes
SHA-256: d10e219137cab9035564ab9ba68ff0a2fe937b9afa53ecb7572707daa62e2bb5
font_02_sfnt_off00012f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1