Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f553898d62a8ea0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 15:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6587956ffcacb6ba50c0ef2b68ea5322 SHA-1: 1da4892ea5b300cc70a482dca45b560a4c6ea895 SHA-256: 0f553898d62a8ea04e8af1b8f644bb9ac0da745113e82e246af1ab0c43ff160a
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable domains, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 https://siroyensao.com/upload/files/35277215955.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/44942510168.pdfIn PDF document text
    • https://angkagenap.com/contents/files/30283830899.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/92268786603.pdfIn PDF document text
    • http://sentai.cc/data/file/20210903_014458_348.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/nubumajadakiw.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/xalaju.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/1336139802.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sapusixutukolawome.pdfIn PDF document text
    • https://limsurempat.com/contents/files/jozenelufanamapagiz.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/46909121537.pdfIn PDF document text
    • http://esistore.com/userfiles/file/lowuxolobugofudo.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/68183783740.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rukerobijodozirujuj.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/78533200670.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kapuvu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/27955594975.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jubonupukufopeji.pdfIn PDF document text
    • http://katela.net/userData/board/file/gilalaxorobugozelesu.pdfIn PDF document text
    • http://letdentalab.com/img/files/toririxawaxogosegol.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nafixozibor.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/15531483531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spectralis+oct+manualPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 10712 bytes
SHA-256: c6a952e3f4a80cc0c4d8a62179766981bb8f585dd434e58e35a3838ba3d41652
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 18372 bytes
SHA-256: 83c1959d142f465b4965705e9aaf0f84f575fb8b4f2e7af2cdb08e8e1bdfef57
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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