Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e8345534f0aeb…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 04:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17321fd5af7eaf60f5412f417598bd44 SHA-1: 6243fefbb44c7111ffd17dce95d57c01aef59fbf SHA-256: f41e8345534f0aeb2756b4cfd2294a09e5ea49600fb52dad9e745df3ec3c34ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.zywawiara.pl/pliki/towipida.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/guzovamokakunefolinave.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/49304976503.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/webunew.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/gosinapoga.pdfIn PDF document text
    • http://kes.org/upload/editor/files/momomuzana.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kokukusisijijikixa.pdfIn PDF document text
    • https://dacola.com/upload/files/zomugopulifuzu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/50624126234.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/65192020875.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/85146827305.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/dajorisama.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/60286664187.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/jafasumopori.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/98726906311.pdfIn PDF document text
    • http://etkenkalip.com/files/39090576363.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/nerofusetodasov.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/56694794104.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/dewipuzefopin.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/56024343969.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460b18142b3---81620622486.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/5437245718.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/zuweragikekenexinokew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=keepass+app+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_off0000acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 10336 bytes
SHA-256: c8a31da5724a48753c3652d7d1e81a3bd4a2c99a3c97b0d2878be3fe324402f5
font_01_sfnt_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 15164 bytes
SHA-256: 637d0dc7c90664e227409996f85eb78398671cfb77ee098d4cdbfbe6e09fe329
font_02_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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