Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d2c3ff4bcf1348…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 02:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cd0ad3cc3fd4cc86fa0de1bca511b9d SHA-1: 5983cb8af09b448ec25cdb1f41577967582297df SHA-256: c8d2c3ff4bcf1348e204c419b2956854b8ad7bb66cca7bbb2c3b6cca30d10cd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://kartinatv.org/uploads/files/61111726542.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/diweliroxarijumuve.pdfIn PDF document text
    • https://terracell.pt/images/file/14524187158.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/24775518874.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wubakigilif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/499f2f699b2ed2e7244a9fe6938ce870/sokuwemaxopamuvedokizafe.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/rixibe.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lenesedigevolegupar.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/zabanisedunewevetu.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/solipevejanuwotosar.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/zaxukudew.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/77714621639.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/sokodesovogowil.pdfIn PDF document text
    • https://kueapem.com/contents/files/75061569404.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53630929715.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zarekijokaxevo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/viwafutu.pdfIn PDF document text
    • http://dakmet.pl/upload/rizazafisig.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/96395184105.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133662aeaa1b---narisajidojaxujije.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51265129330.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/nanamikenozixopidisobov.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/36255596747.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/82269768557.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/75127607628.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/tatamun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kimetsu+no+yaiba+the+movie+mugen+ressha+henPDF 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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 20312 bytes
SHA-256: c4f3e584b0771078b292f27f5b16ad35ba65457b73b8b90309c3c37cdc90f477
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 10920 bytes
SHA-256: 209f024ba2aab67cebb5ba97c3d658a495d8fcecdad5fe844bae5eb4d1d15c23