Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1c1db93ce06039…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 01:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 184149d67fc1f702247e5cad6c510273 SHA-1: dcbcc830e00198d1a2e55da7706ac3a989d4a13f SHA-256: ba1c1db93ce06039c27ea4bb0ff483620c839269c1639f239990e47d0064e24b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external files, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing attack, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.integra-cr.cz/administrace/ckfinder/userfiles/files/bimudofegebapipowu.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gufibifeketera.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/vewedesokelanunigeditino.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/napetujokusixe.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210907041923.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/depivekegalexabotipaperur.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_3609FAC92FCE361D.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/52172602166.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130609510f0e---41555241844.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/fulezoferododawadolokutaz.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/71874065515.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/51107429795.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210905_064742.pdfIn PDF document text
    • https://proia.bg/userfiles/file/60692387200.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904072557.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/99387091041.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25087945251.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sixegozikunojodofokilim.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kudaxejorusiruborokikipi.pdfIn PDF document text
    • https://yellowstonewildlife.com/35385075313.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/79001271630.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/92579871969.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/23299142845.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3cf7c66f---navoxemurakudex.pdfIn PDF document text
    • http://373113.linker.tw/files/10340037983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=geometry+dash+mod+all+unlockedPDF 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10888 bytes
SHA-256: 23a6b7e891c42b4efbde5c08bd5cca943d4612a9ad887d004ad41549b9d93bab
font_02_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 19292 bytes
SHA-256: 4fdb5668de807bfb4609935da2ab786566b3ffc422a498d5d051795468b3aeca