Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa4ff2b82a31f9d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 00:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79ecd640fd0a2e66e70ea6cd6ade89c8 SHA-1: 98d4409f41553dcd6b476a577adfe37366ed37ab SHA-256: eaa4ff2b82a31f9d4c93954ea6cead52bba9962e769dfb00f3cb8ff5d6976196
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=nintendo+64+zelda+rom PDF link annotation
    • http://csc0516.com/userfiles/file/20210912172059_bpfhvn.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/telozowigobijexotab.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/xarutegiwatusiwalibit.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/51476723601.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/56944470957.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/28855983966.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gufabelabepe.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/35482971512.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/zijoguviwesu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68326998996.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090112494939.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210906074524.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e335fb3494---42730524549.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/piketipuza.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/kazeroxovojegiwosomaxefaw.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210902_6BA912C844286145.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fewil.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/75367557798.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/vagozugisunudojelukabo.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/16064631155.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/tukaji.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/95428521112.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf36f3ca3a---21276010913.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/zokafaxaboloturejumo.pdfIn PDF document text
    • 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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 18420 bytes
SHA-256: 3cd459e0b9fffc2a90260e3aa62cc67cb5dc2eda9c431a672e39a9cfae766db2
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10524 bytes
SHA-256: 7c3c5df9e9954e2696e34fa2b318910fc69fc3d8ab67a1f260e3e9e9234da542
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1