Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb18bfc85c012eae…

MALICIOUS

PDF

76.3 KB Created: 2021-09-26 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8c3dbfadb3044149069921cd00dda0b SHA-1: 39cc0d6deeca6a2d58b01eb5d4a6cebd14c287f8 SHA-256: bb18bfc85c012eaed3fdcb3fab0502238682e63bf49f9da48321be15caac30ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents to host links to external malicious sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://autoradiator.mn/uploads/ckfinder/files/97766719970.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3932a3d37---22156262194.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/89784010057.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ruseselotakisero.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/6923480503.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/fapenitifuvomunaf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f3652d8d8b404cc44c01f830b7ef21ae/24062729922.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/45272045955.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/vugubuxosanuxinulejabidit.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/zaferugisumujozefev.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/36408697037.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/40938287090.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/toxiwazozelabafub.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xegoma.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/33079959674.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/11768096316.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/fuvetax.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/suzudo.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82892923295.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/fetokekuzefuxob.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/veviponazusuj.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/40826541334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=learn+to+fly+3+download+androidPDF 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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 19828 bytes
SHA-256: 527eb45a023ba316e5280e920062c2735184f4fcf295cdb6ad3d431c72a24469
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10508 bytes
SHA-256: a0c7b796ff1871a0d0789d10ce32d3e642b5c4b4d980b8236863ac427d0d81b7
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1