Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f9a34bbe4e825…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 07:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c01a45d1f3f052fe2b138441b06de693 SHA-1: 7c87c693b2d040f9ac3d3153934b9e33c78b71de SHA-256: 0f4f9a34bbe4e825b725ba9a65d1f4f2a4a1d438f6820f5f67307b93a85791ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting, coupled with numerous embedded URLs, suggests a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://teresachild.com/upload/files/susizoxuximafamikuwolelil.pdf In PDF document text
    • http://telesson.net/_UploadFile/Images/file/wulosorumip.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/lowunajumexurevogonexake.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/pujikezelogube.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/92440172934.pdfIn PDF document text
    • http://www.520amis.com/upload/files/bimeka.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rizarikusewebumajuxesewe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16150a49f2fa7c---56236541047.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/80809882342.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/14004759619.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/59004071053.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/puwerosofatazuwuju.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/mebopanigaxonezu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/keretajemum.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/tugewaledu.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/14830862795.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/lapaburudodiru.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/94474308649.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/ginivefufajigexoxipowuwa.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabowupaxur.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/4702231653.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/lujenexezigepukilezuzew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cash+magnet+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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 15760 bytes
SHA-256: d78dde880b1432ced8b7659292b733cafd2118f6b5e929d65e0cc6a63a1ad77f
font_01_sfnt_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10788 bytes
SHA-256: 4ca75ca7299d0728a3ee40270527073e16eebe5f30cf5d0fe089138a53861304