Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3dac0558a46cc8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 13:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27b1b50e64470da2e6cd3fc2ab675756 SHA-1: dedf9e2a5b72473d4fc8d1172fca24a387e0fbd0 SHA-256: fc3dac0558a46cc8963a405e846774b4d56b6a05e8a6ffa5ea4b5f8ee56df6da
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, with one specifically pointing to a URL that appears to be a redirector for a potential malware download. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=netscan+x+apk+for+android PDF link annotation
    • http://muabannhagiare.net/images/uploads/files/janarokopirilazeti.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/netewelivabek.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/merilepalilabotiz.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/80454373250.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/bijonosetagewobikibatitox.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/43013365969.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/67874610535.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210909204745_z3tdrs.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/42426052532.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342801a686b---67794640853.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/gaxebibifetip.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/81713657209.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/22216104547.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wubukegakizugosaboko.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/dojipafiwemin.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xufilikumagidufejeri.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/vimozejovizobubeju.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/tidapowijijaxelojuxa.pdfIn PDF document text
    • http://sayarbobinaj.com/file/lakodokifoz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/sarobijuw.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/jamarego.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/rojemobivujivowozavow.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/fipevamusajabodalixib.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/sunag.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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 17420 bytes
SHA-256: 3b4f1cfb5486bad7410ad463dbdd0f44cecffbb2dcd206d4fd41dbe98a04bbce
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10736 bytes
SHA-256: 4b441e4f6ee965c0968053d3866be0b988466218a05cd57a70ac3a3a269c3f3d
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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