Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c377f04321abf6…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2785b7b3fdd6c7b87842cfa1d982e1a4 SHA-1: 86080f0751242fa4af53d06cbaed0067bede3afd SHA-256: 82c377f04321abf6f532b6426aadebeaa456647e42c20e2c2b9362b6410a4b37
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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://aroma-es.red/yamituki-n/uploads/files/1433679863.pdf In PDF document text
    • http://location-venise.com/italie_documents/files/90608405441.pdfIn PDF document text
    • https://chilepools.com/contents/files/72155776239.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/zujunanutigozijazavite.pdfIn PDF document text
    • http://schokofontaenen.de/idata/83652704931.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/lixosolojedosuguzuxe.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/57226386022.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/pusulobokutuse.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/pefakisalewenaxojalu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/fugamogozipeteta.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/67581554871.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/tejul.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/voxajowogudanepudaf.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zaguxe.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/kakoporofafem.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/45974398266.pdfIn PDF document text
    • http://idroter.org/userfiles/files/werexitakidu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36975157195.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/50529641523.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/xizalovoxibupaxogilavane.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49512491435.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xorazotufirepu.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/11639407936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ice+planet+honeymoon+read+onlinePDF 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_off0000adc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC9 14620 bytes
SHA-256: f6e2eedd9e6e0e473cada8cff7d093059bb93aff8c0de226a09b70290b10789e
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10676 bytes
SHA-256: 1a159007a647541c9c5ea719c3e26141c0e863b07f6369478e63228dc93bf73c

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