Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52b130c4db0e7c1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 02:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: eb36c36818d6de05f5d43300d7be3607 SHA-1: fdb6d291e5cff55fad6972d078d846dfe4ebf854 SHA-256: e52b130c4db0e7c128b12cb619ff68b93c4328d9d9e29a18f33e7ece56c30ccd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=what+does+a+network+specialist+do PDF link annotation
    • http://50offshop.pro/91432437245pcnzu.pdfIn PDF document text
    • https://naratejog.weebly.com/uploads/1/3/2/6/132682615/01f05728.pdfIn PDF document text
    • http://winoorama.website/xbox_one_controller_lb_button_stuckqcnzu.pdfIn PDF document text
    • http://899themes-demo.ru/reading_comprehension_exercises_with_answers6k2yb.pdfIn PDF document text
    • http://rijebutaj.22web.org/11167217006.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/pudilivowegirirazixu.pdfIn PDF document text
    • http://study-english-05.site/zibobue8zw.pdfIn PDF document text
    • http://bobutukaboxavaj.iblogger.org/slow_call_of_duty_update_xbox_one.pdfIn PDF document text
    • http://pshcomonhere.xyz/lojedetubutetjpvu9.pdfIn PDF document text
    • http://zelegurelo.iblogger.org/firawupewekarivek.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/guwojoz.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/fujimixavemunip_kitasiweb_kavanibirugesag.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/cd744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/42719690955.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/fojomala.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/ranenawoponomipufuju.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/wafexabigafegavegub.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/dubelivumozel.pdfIn PDF document text
    • http://defafezo.epizy.com/b2b_content_marketing_strategy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/68758490845.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/gemugexusebemo.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/fokimibinivibokebifuz.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 5120 bytes
SHA-256: 097637aa9a13089ab578552234dcd3d3f0e5244a6d110c4b58b23a412d8b2904
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10880 bytes
SHA-256: d9aa76af21d366a01cd39ef0c8f06ffd81fa1c9a320919cefb8fb382dcf02b06
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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