Malicious PDF — malware analysis report

Static analysis result for SHA-256 9239c39fd592dc51…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 07:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2f77f75d51e76a27c4ceab45e9e29a7 SHA-1: 49c8608b4f9b3d411eed2836f228c80ab12e0240 SHA-256: 9239c39fd592dc51547c409cf2c9cec6b04a0957db63638eb2771a8c29b9a02c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://3dtechgroup.com/uploads/image/files/nafokovagexigilun.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tekugulobujomuritapere.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/72984559043.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/76982293474.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/rukawodomi.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/22988697978.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/65742019883.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bf6f693f87b68bd19bd2351c7163fe2c/53140711111.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/lurew.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/fofibogapepox.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c8af3d6---fixozivu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/guzuxuzefisuvip.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zagik.pdfIn PDF document text
    • http://cartopack.be/Images/file/50825274082.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/38215525505.pdfIn PDF document text
    • https://sanidom.pl/img/file/34289236887.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/tifure.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/70419559548.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/2438771427.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wavenavopopetagutasotukur.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/lugag.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zonujiwasu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xageniveporibawoxovexox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+helper+apk+download+for+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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 17712 bytes
SHA-256: 4c142be49ccd405602ef8d8a51aa6b0655a263f09dea45ec6129cc24eebf4aa6
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10508 bytes
SHA-256: 18be894bd983b97c20752087e3371a45bccdbf836d6a3486ec1607cc4a9f9cf7

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