Malicious PDF — malware analysis report

Static analysis result for SHA-256 409fcd7fb8bf0fc7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 20:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bd90e82a298c20a5a62caa16bbd2ce9e SHA-1: 7331bcd9bcd187b395689967c2a330e9d0c3fffb SHA-256: 409fcd7fb8bf0fc737f76582e4312921ee0b9aa8ac859f85f9926e616d348569
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many pointing to PDFs hosted on disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out the use of disposable hosting for multiple distinct PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dellalontra.it/userfiles/files/lidexuxotavixivokanaj.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/woxuwiwerolu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bofefutexa.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gixoza.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/31302077993.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/biromidu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/54165157854.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/47325810715.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/budebovizugeguze.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/vugabazowegebuk.pdfIn PDF document text
    • http://topp.pl/_topp/file/dujopoxowobedusezosi.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/wuzukowebemipatipafiraxux.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nufodukesorurokiwad.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/56183663155.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/wakok.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/majakasevawizusixab.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/bokebabokuxokawojoxaxupix.pdfIn PDF document text
    • http://medrea.ru/upload/files/19861507814.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sititazifivipumudodevig.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/duxutedixug.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pilurupinesijugaxusizewi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/vitoniloximumozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=change+dns+on+android+lollipopPDF 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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10604 bytes
SHA-256: 3ed6514de2af8b22d9b675bb6545fa071ee788c8e30eb69d1926915e639b8437
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16940 bytes
SHA-256: 1ed07b68c42b1e93ce2180352512c12fb0a320306edbdc938222240ca2fa5e18
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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